The Counterweight by robertmekis
Wallpaper and zoom: http://www.robertmekis.com/?kateg=painting&obsah=painting051a1
Concept art from my personal sci-fi project. It's environmental study of the structures on fully terraformed asteroid - specific place with non-coherent gravitational field. Place full of pits, cliffs, holes, caves ... you name it.
Picture was completely painted in photoshop using basic brushes and smudge tool. Textures, neon effects and scratches are applied via simple overlay layer.