I think maybe you need to settle on a more organic idea than havifn a tree in the middle and someone in front with two different backgrounds and a blue sky.
Maybe just the tree, maybe just the dark forest. Like, could the cover be an illustration of a central scene or theme in the novel? Like the main character walking through the dark forest carrying the dragon egg?
I don't know, I haven't read your novel.
Here are some ideas maybe idk if you can use them.
But either way, I mean, I hope you find someone to do your cover.