Liquefy
I spent some time reviewing Paul Campion's video tutorial on Texture Painting. His approach is to cut up bits of his reference photos and paste them onto the basic Lambert render, blending all the edges as he goes. I guess part of his motivation is that the 3d model doesn't fit the reference all that well, so such a drastic approach is necessary. I had another go at texture painting my model, but ended up using Liquefy for pixel pushing instead. My photos are actually a pretty good fit, given that I used them as reference for modelling.
I had a couple of goes with it, and ended up with something a little better than yesterdays effort. However between saving all the different versions of image files, I ended up forgetting to save the actual blend file, so I've got nothing to show for my efforts. Except experience of course. I feel that I'm getting the hang of it all, and it won't be too long before I've got some pretty good results. I guess then I'll have to thing about hair, and doing some proper eyes. Once that's done, a nearly usable model. Well, a body might be useful, and some clothes. Might get them from somewhere else. I'm pretty happy just working on heads at the moment.