The author says:
Eira was conceived for one purpose – as a sacrifice for her narcissist mother’s plans. As the time approaches, can she overcome her conditioning and escape to the freedom she desires? Can she then return and put paid to the mother that has kept a land in misery and thrall? Genre: fantasy/horror
I can’t tell from your synopsis what the setting or milieu is supposed to be… but that’s okay, I guess, because I can’t tell it from your cover, either. Is this high or second-world fantasy? Urban fantasy-horror in a modern setting? I dunno. There’s certainly nothing that indicates magic or the paranormal in your cover.
The other main problem is that nothing is readable from thumbnail, not even the title. Glancing at the thumbnail (which is the way most people will first encounter the novel) just gives a monochromatic impression of snow. It could be suspense, police procedural, or even a slice-of-life or coming-of-age literary novel. There’s simply nothing there to grab the attention of the target audience and tell them, “This novel is for you!”