well damn, you COULD HAVE finished it over the last six days you have been saying that you wished you could finish it.
One actual thingy of advice:
I think I saw from a screenshot you posted that you use a Mac. would poser work on a Mac? I'm not sure. You could use a poser figure as a simple reference and draw the Hulk or any other character proportionally from that. I'm not saying rip off poser figures in your stuff (like I do) hehe , but its a great tool to see how arms and legs look in perspective.
Looking at your Hulk, the only thing that looks off is the arm. I know the arm is pointing forward from the elbow but the perspective got lost. This is the only place that probably bothers you because everything else is fine.
It would be fun to see a giant, oversized mouth on him, yelling and grunting. If you need a reference for a big mouth, you could always use mine. Let me know.