Not really, just be self critical about your work (there's always room to improve) and keep learning in your own time. You keep going like you are and you'l bel sure to learn things along the way. 

Guh, messed up on that hand more than I thought. I'll have to go back and fix it when I got the chance. Thanks, by the way. Do you have any specific tips I can use to improve?

Oops, looks like you made his nearest hand inverse, its facing the wrong direction, thumb needs to be facing the body. Your art looks decent from what I've seen so far, howver lacks that precise pixel level detail, which I'm sure will come with time. Keep it up.