This is a character I sculpted a while ago but recently made a realtime version of it with normal maps, color map and specular map. Mudbox was used for sculpting the high poly, topogun and maya for creating the low poly, xnormal for generating normal maps and AO maps and photoshop to texture it. The color maps is hand painted, no photo sources used.

Recently I made a small workflow tutorial at the AREA:
http://area.autodesk.com/index.php/tutorials/tutorial_index/street_cop_workflow_by_mashru_mishu