Nice wall and good idea, but Allen seems stading ot from it, maybe due that light/shadow source, where I don't understand somehow the purprose. Would match in more to the brighter background without them.

The colors are good,and the graffiti are nice,but that multiplied text seems off,as well as the greenish swirly thing on the right around his arm...I don't like the light beam on his left,as well,it seems out of place,and it's without purpose,so I suggest you remove it...the walls look nice when you keep them simple,adding too much stuff,makes the wall too crowded...
Nice work,though,and I'm glad to see a wall with that awesome scan