What is that blue stuff near the bad cropping on his elbow?Just keep working at it... You'll be fine.
I love the background and text which allmost suprizes me. Its something diffrent that worked. Maybe darken the bacgrkound a bit though. Also fix up the croping on his arm. Keep working and this will be a good wall
I'm really liking everything but the text here, it kills it IMO. It's too small, make the placement better, and make it a little bigger, and I think it will help the Wall out a ton! Good stuff overall though, keep it up!