This looks like either a: you used one of those shitty "ai" coloring tools or b: you just used the paint bucket and went to town in a very half-assed sort of way. The color choices are glaring and oversaturated. There are a bunch of spots where your paint bucket tool didn't reach and you didn't fill in yourself.
In the future use the cover art for reference to fill in your palette. Even with a cover with only a few colors like this one you can pick colors with similar values to do the job. And sometimes less is more. There's no need for bright yellow hair, a bright yellow wall, and a bright ass teal ass sky within a handful of pages. Use some restraint for godsake. Also, the fill tool is fine to start with but you gotta actually get in there and finish it. Don't just leave every letter 'B' with a big gapping hole in it and don't just leave a bunch of pixelated white outlines either. Set the line art layer to multiply and actually color that shit in.