Hello everybody, this is my first post.
My name is Gerard, I'm from Spain, 22 years old. I would like to learn pixel art to start in the world of game development. As I asked questions of how to start on pixel art, people told me to try to draw stuff by myself, and so I'm trying. I don't wanna bore you with my life so there go some sprites:

       

Okay, I posted here because I have a hard time shading the earth and the barrel, and I want feedback about those. If you give me feedback about the other sprites it is fine, but I don't plan to edit them anytime soon.
I also know the level here is very high so please don't ruin my motivation.

Thanks in advance,
Gerard