Good job Lukas, everything's colored neatly, and for the most part, it looks good. 1 thing you should work on, is making sweat look more realistic. On your coloring, the lines for the sweat marks are there, but it's colored the same as the skin. 1 option, is to erase those lines, so you don't have to deal with it, the other is to look for a tutorial somewhere online, that could help you. You could even ask another colorist here for tips.
Well besides that, the only other thing that you could improve, is the Rasengan. You colored the Rasengan good, but it could be better. I think Diabolumberto aka Berto, an artist/member here, just made a tutorial for coloring Rasengan, and Chidori, so you should check it out. Berto is very good at what he does, and if you're not familiar with his colorings, you should check out his gallery here. His tutorial should be there, but if not, you could find it at deviantart.com. Just type diabolumberto.deviantart.com when you search online, and it should bring up the link.