Edit:
Thanks for all the feedback. Here is an updated version based on feedback here and other places I posted this.
https://pasteboard.co/GJN5PSH.png* First thing you'll notice the word "Bououououououous" at the top. That's the title cut up to give you a sense of where it would go and what it would look like. The game is not actually called "Bououououous" and the letters won't look like they've been cut up.
* I cropped the scene to focus on the characters
* I added darker lines for the interior of the characters and even thicker lines outlining the characters
* Changed background to use rock images rather than the fuzzy horizon
* Changed lighting to be brighter and more red than blue. Changed the pattern where the lighting falls off
* Recolored trees in background to be more blue than green
* Took out larger stars
Old:
This is 'box art' that will be used for an upcoming video game (not physically on a box, but on the digital marketing stuff). I have little experience with digital art, so I'm happy it turned out as well as it did. I'm looking for feedback to touch it up, rather than fundamental changes here. I have things saved in layers so I can move and adjust some things a bit.
https://pasteboard.co/GIFPwHw.png