Young artist looking for help/critique

[CosmicIllustration]

I'm looking for some critiques on a current piece, for a bit of background:

I'm 14 years old, I draw in Photoshop on a tablet and I hope to get a job in illustration or character art sometime in the future. I've recently been having troubles with value and anatomy, plus I'm not sure how much I like the colour palette.

Any critique helps, thanks