I think this is very cool and very dynamic but it has its issues. I don't have a problem with the hand size but Hulk's overall size in comparison to the bg is quite off. The rhubarb piercing his skin is the right size in comparison to hulk but that is some massive rhubarb for street level. The last thing I noticed is his incredibly long neck which makes his traps look silly. I used photoshop to give you a quick view of the fix. Don't take this as a bad thing, your composition is incredible and your modeling is obviously very good.
I used to have an invisible freind once, but then he stopped believing in me.