WOWWWWWWWWW!!!!!!!!!!! This is stunning. It must have took you very long to do, and it has so much detail. I stared at it for a long time; jaw on the ground. He's got great armour too; stealthy! Everything looks pro and poportional.
If you're really stuck with colouring, there are some great comic colourist that can do a brilliant and professional job for your linearts over here on deviantART. Just as long as you ask one of them. I did when I want to collab some of them. And no worries!