As an artist who enjoys comic art, you've created a good piece of work but you have the skill though to pull away from duplicating Jim Lee's art. This, your Wolverine, Green Lantern, Batman v Superman, etc. Many won't spot the copied works, but those familiar with them will.

So use him to help you understand ground rules, techniques, inspiration, etc but I suggest you don't directly copy his art. Especially to then just to put your signature on it without giving any credit to Jim Lee, because it comes across as somewhat deceptive.

*Superman not in the center because he's unpopular now*
*Feels Batman*

also if you ever do end up taking suggestions, I'd freaking adore some (Neil Gaiman's) Sandman! It should go without saying he'd work very well with your monochrome, sketchy style; plus you could make him so many different ways that he'd be impossibly to mess up! :D

Incredible work! The poses and layout reminds me of another picture I saw, and do you take suggestions? If so could you draw The Shadow?