This is awesome! I actually coloured these lines ages ago (it was one of my first colourings). I think it was a little beyond my talent, I might give it another go in the future but now that I've seen yours, what's the point. Here's mine if you're interested [link]
Fantastic job, I really admrie the wrinkles of the pants and shirt and the coloring of the vest of the skateboarder; also I notice how you created the illusion of distance making the backgorund building's fainter and desaturated of their color. I know you didn't draw this, but I like how all the thin and wirey characters make the hulk look even more massive. Beautiful job.