Hi, Don't know if any of the following will be any help to you, but here are a few tutorial links that regard textures on figures. Might be something helpful in one of these places. Don't know if you belong to DAZ as you might need to join to access some of the tutorials. (Joining is Free)  Have a great day!

Tutorial Links:

3D Model skin from Photos: 

http://www.daz3d.com/i.x/tutorial/tutorial/-/?id=2123&_m=d

Avoiding Seams in making textures:

http://www.daz3d.com/i.x/tutorial/tutorial/-/?id=973&_m=d

Making Unique Head Textures:

http://www.daz3d.com/i.x/tutorial/tutorial/-/?id=924&_m=d

Texturing Skin In Photoshop ( Sure you can use other paint programs such as PSP to get same or similar results)

http://digitalproducer.digitalmedianet.com/articles/viewarticle.jsp?id=31082