The perspective on the dude’s horns is weird. It looks like they both point in the wrong direction.
I did a quick sketch of the view from the top. I hope you understand what I mean.

For the female lead, I don’t think the current pose conveys uncertainty. It is way too neutral for that. I think it might be better if she stands less straight, her arm not just at her side, and slightly worried expression.
Finally, from the current image, I feel like the framing is slightly too tight. It needs a little bit more margin on the side, otherwise it might look like a badly cropped image.
I might have sounded harsh, but I think you have a good style, and even if you ignore my nitpicks, your cover will probably still be good.