The sig could use some colour. Apart from that its blended well, the text is a bit boring and the bg is alright.
The cut is alright. The hair is dodgy but thats the hardest part to do. And bits on his left wrist (our right) looks a bit dodgy as well as a bit on his knee. Other than that it looks great.
Generally wat i do is if there is anything sticking out or making a part of his body not look natural i would cut it off to make it look flat. With his wrist just cut the weird bit off.
I'm not gonna bother fixing it up, but I'll know for next time. I did consider doing that when I was seeing if I'd cut the knee properly but I couldn't be bothered and it was late.