step by step 1: create structure with hard brush adn a couple of custom shapes 2: refine a bit in black and white to make volume pop out 3:I took a photo that i blur pixellate in multiply mode 4:I reduce the opacity of the black shape to 50% giving me a 50% grey so i can overlay on it color or texture without loosing the original colors 5:add textures and some photo incrustations 6: polishing 7:tweaks , dodge tool, high pass , sharpen etc...