The author says:

Tommy Travers is a teenaged recluse who dreams of entering a book and never coming back. When he turns 15 his wish is granted but unlike reading, the consequences are real. YA/Adult novel

Nathan says:

The artwork’s terrific.  The type treatment, not so much.

As you can see from the thumbnail, the title retreats into the background, and the byline is practically invisible.  It’s even worse on a black-and-white ereader device:

The bottom half of the image, under not-Godzilla and the ship, has no essential detail in there.  Rather than try to crowd the title over not-Godzilla’s head, I would leave the series title up there (with a larger and clearer icon of an open book worked into it), then put the title below, in clear bold letters on two lines:

GIFTS of
the MASTER

I’d probably try putting the text in a white or cream with a dark border or outline.  And then I’d extend the byline across the width of the image. For both of these, you’d want a wide font, rather than the current tall one.

Other suggestions?

The author says:

Sports plus romance between two dudes, Sports story about two college age dudes who meet when the straight dude moves into the front house, and they start practicing Soccer drills together, and playing on the same team. They draw closer over time, share a lot, and the straight dude finds himself in love with his slightly older mentor, coach, who’s been like a big brother, nurturing him. They run up against circumstances and ingrained attitudes and both have to get some enlightenment in order to reach a happy ending.

Nathan says:

Again, I’m not even remotely the target audience for this, but here’s my first big impression:

BOO-ring.

You’ve got a guy in shorts just standing there, against a white background. Even the type is dull.  Take a look at this and say, “If I saw this in a bookstore or on Amazon, what would make me want to pick this up?”

Remember, your readers have a choice, and the choice isn’t between your book or nothing. It’s between your book and the other books next to it.  Why would someone want to check out the description on your book, instead of the next book to right or left?

There are plenty of romance novels. There are plenty of gay romance novels. I’m guessing (without wanting to check) that there are plenty of sports-themed gay romance novels.  Give the readers of sports-themed gay romance novels a reason to think that this sports-themed gay romance novel is the one they should check out.

Other comments?

The author says:

This book chronicles the steps the five terrorists of Flight 77 (that hit the Pentagon) took in suburban Maryland in the two weeks prior to 9/11.

Nathan says:

The subject matter of this one practically demands that the cover content be (1) an airplane, and (2) pictures of the five hijackers.  You’ve got that part.  Now, what should you do with it?

1. Lose the swirly filter. Seriously, I don’t even know why they include that with PhotoShop, because it’s impossible to do anything good with it.  The look you want here is “stark” — deep blacks, bold contrasts.
2. Those cover elements, being obligatory, don’t need to be the dominant elements in your cover.  That should be your title. Nonfiction covers have an advantage over fiction covers in that regard; readers don’t mind if your cover tells them with words what the book is about. If it were me, I’d have the title take up fully half of the real estate here.
3. While your title font choice isn’t necessarily bad, you’ll notice in other covers that as the subject of the book becomes more serious and worthy to be remembered, the title fonts tend more toward serifed fonts in capital letters.  Why? because a font that connotes two thousand years of history says, “This is important. This is permanent.  This is worth being remembered.”  Trajan Pro (aka “The Movie Poster Font”) is becoming too overused to clearly give that connotation, but there are other serif fonts that can give that same impression.
4. Your subtitle font clashes with the title font — and I suspect, would clash with a serifed Roman font.  Try using the same font that the book text uses.  (Also, “driving tour” sounds waaay to idyllic for this subject. You’re not sending people on a terror-tourism family vacation here.)
5. The title is centered, the subtitle is centered, the airplane is smack-dab in the middle, the five headshots are center-aligned… Why isn’t your byline centered?  I understand the impulse to add some variety, but it just ends up being the odd element out.

Other comments?

The author says:

A werewolf lives through the violence that is human history starting in medieval times and eventually finds himself working for the United States Government, they don’t let him leave when he wants to quit and then he has to team up with other movie monsters, a vampire, alien, demon, and frankenstein monster, to stop an evil robot from destroying the world.

Nathan says:

No.

This looks like a tumblr meme, or something you slapped together in five minutes to display your makeup FX selfie. This will NOT sell this book, or any book.  You may think I’m being cruel, but that’s the way it is: If you expect readers to spend money on, and time reading, your book, you need to demonstrate that your book is a professional production. This doesn’t do it.

Hire a professional.  Even a cheap one.  The fact that you’re submitting this here for critique means that you do not have the grounding in basic design needs to recognize the deficiencies in your abilities.  Just go pro.

The author says:

Welcome to the Weird Wild West. There are people here who are not as they seem and others who watch them. Supernatural and mortal alike unite to reach what peace that can be found between them as hunters can become prey and prey can become the hunter. This is their story.

Nathan says:

Nope.

Those pre-made Cover Creator templates look exactly like what they are.  They scream, “I’m self-published, and I tried to save money on a cover!”  At least the image you chose doesn’t clash horribly with the template — the diagonal of the paper background intersects in an interesting way with the diagonal of the roofline — but still: Nope.  It looks impoverished and amateur.

On top of that, the image you chose is Western, sure, but there’s nothing weird or paranormal or off-kilter about it. You miss your entire audience if the cover looks like “a happy market day in the Old West.”

If you just found a Western-themed photo or illustration (preferably one that concentrates on an individual or some other central image, instead of a town) and then applied a color scheme that you find on horror novel covers (stark contrasts, lots of shadows) and a distressed Western font, you’ve be about 400% ahead of where you are now.

Best of luck.  Other comments?