It's not just the detail you put into Hulk that I like, but also the amount of detail that went into the environment around him. Right down to the reflection of the white building across the street. Your great dedication to the finer details are what make this pic so damn awesome.
You know... one of the big things that gets me about these is your urban environments... I can't quite figure out if you've done some post work on some simple 3d renders, or if you've cleverly used shapes and layers (with textures) on a perspective grid to achieve your results.
Any tips or suggestions? Urban environments are always tough. Wether it be creating enough variety in your building types, or keeping windows to scale from building to building, and making the buildings interesting by actually making them look 'built' by having ledges and elaborate architecture - as opposed to just having a cube with a window grid/ building texture loosely thrown on.