From the blog "Working On The Slave Trade"

Introduction   This is a tutorial about using Blender to project images onto body mesh. My usual approach has been to paste designs into a transparent layer on top of a skin texture then to drag, scale rotate them and hope for the best. The results have been mixed at best, with tats deforming as the body mesh curves and a lot of guess work being required to get the image correctly placed. I've also had to place them a little oddly at times to avoid seams in the UV map.   The approach I outli