All about banding.

Yours is not the most blunt case, but there is some banding-like effect in the leg seams for sure. Also the clothes are way too monochromatic and / or saturated.

Good pose; but the face is not really readable.

Hey, thanks. The legs are intentional, typical shounen legs, my reference pictures were pretty much the same.
I don't understand what you mean by "banding" - could you explain it to me? (I also speak german, if that helps)

The legs seem way too long -  you also got some banding, most noticable on the legs. nice, otherwise ^^.