hello was just wondering if anyone could tell me how to paint textures like the diffuse maps they use in make humen things like adding vains pours difference in skin tone things like that ive looked for a few months on you tube and google searches but have been unable to find much that was helpful I also think it would be great if cgcookie made something in regards to paint your own diffuse maps in gimp and photo shop
I don't know; it sounds hard to hand paint a complex texture like that. Usually you'd find them online or make them with Substance Designer.
Hey, we do have quite a bit of the site dedicated to painting in Photoshop. I'd recommend checking out these for learning about painting skin and texturing:
https://cgcookie.com/course/introduction-to-materials-and-texture
https://cgcookie.com/exercise/exercise-08-material-studies
https://cgcookie.com/course/animated-character-portrait
https://cgcookie.com/exercise/exercise-01-the-female-headshot
Also another great one by @jlampel https://cgcookie.com/exercise/texture-painting-an-ax
Yansculpts has a great tutorial about texturing skin: https://m.youtube.com/watch?v=ktsyL2Kp5bQ