Hey, looks pretty good! I'm not an expert at all, but there are a couple of things I'd suggest. First, you could try using textured brushes. They look way better than the standard smooth brushes for this kind of style. Also, since you went for a kind of low angle perspective for the characters, the horizon line should be lower. Other than that, very nice work!
Thank you! I didnt think about the horizon at all, just put it there, you are absolutely right it look wrong, im going to try to move it right away :)
I thought the textured brushes were more for the experienced artist, and it would be too hard for me, but i Will try that too ^^