The author says:
A time travel novel with a strong, female protagonist.
Hmm. You didn’t give us a very big image to examine, so we can really only critique it as a thumbnail. There’s only a very short description to compare it to, so forgive us/me if the advice we give doesn’t match the novel well.
First: Fonts. My rule of thumb is that, unless you have a compelling reason, try to limit yourself to two typefaces. I don’t think you’ve got a compelling reason; what’s more, the most difficult-to-read font is used for your smallest text. (Another rule-of-thumb: The smaller the text is, the easier you should make it for the reader to read.) And your largest type, your title, is in your most boring font. I understand that big, bold sans-serif typefaces can appear strong, but I think this one misses the mark.
Second: Cover vs. description. All that we know about this time-travel novel, really, is that it has “a strong, female protagonist.” If that’s the most important thing you want the reader to get from your cover as well, then the image should concentrate on the female character more than the male; as it is, they have pretty much equal visual weight. I don’t know if the original artwork has cropped-off portions; if it does, you might want to crop it differently so that the female is central and the male is off to the side and partially cropped.
Third: Layout. The pattern you use — am image in the middle, completely separate from text above and below — is more often used for non-fiction than fiction books. Again, if the original art allows it, I’d recommend the text go on top of the image.
Fourth: The words. Maybe it’s just me, but I really dislike subtitles which essentially tell us the (sub-sub) genre of the book. Maybe it’s because you see it more in crank-em-out erotica ebooks: “A Polyamorous BBW Shifter Billionaire Romance,” etc. I’d recommend something more like “A Romantic Adventure Across Time” or somesuch — something that tells the reader about the contents without seeming like a taxonomic classification.
Fifth: The words, part two. I understand why you have “by” in front of your name; it’s such an unusual name that readers likely wouldn’t immediately identify it as the byline. However, the “by” just seems like it sticks out there uncomfortably. You could solve the problem by combining it with the tagline and putting it just above the byline — “A Romantic Adventure Across Time by” — instead of under the title.
I really want to do a five-minute mock-up to show you how these fixes would fit together, but the small size of the image you’ve given us doesn’t lend itself well to that.
Eh. what the heck. Here’s something.
These aren’t the fonts I would go with for the final, but I think this gets across all the ideas I was trying to spell out.
Anyone see something different?