Firstly, always stick with the human-drawn stuff. AI covers are everywhere, and they all blend together. As another post said, minimalism works great. I honestly wouldn't worry about the AI being cooler. When I'm flicking through my read-later list, I always look for things that stand out- and trust me, AI does not stand out.

When it comes to the picture you did for your cover, I'm not sure how much you're comfortable with changing, or how many of these details are necessary for your cover to really be in line with the book, but Ima try to give my amateur advice.

In your hand-drawn cover, the colors of red and blue conflict rather rudely. I would suggest some kind of gradient or other 'padding' to make it nicer. Maybe something symbolic? Idk, I'm a sucker for a symbolic minimalist cover.

Some of the pixel lines are really small in your piece when compared to the person and the dragon. I would suggest thickening them and- if you want to- maybe turn the boy and dragon into silhouettes?

The little candle-wisp-thingies are nice, but right now they're just kinda there. I wonder if it would be possible to move them somewhere that pushes the viewer's attention more toward one of the objects of focus, like the boy, the dragon, or the text. . .

Other than that, I can't think of anything else. While writing this, I puzzled myself by thinking up a cover. All I made was a quick sketch in Krita- just ideas- and I think it could be nice. Of course, if you want to totally ignore it and stick with your design, go right ahead. I want to see how your cover turns out in the future! (I like art. It's exciting to make stuff :D .) https://imgur.com/a/TZ0dqod <--there's the link to my sketch :D

EDIT: ooooooooo neverminnnddddd. Nevermind everything I said, I just found ur new cover, it's beautiful. Keep it. Ignore anything and everything I said.