So I've come across some Destiny texture work by Sid Moye, and I'm wondering how the texturing of the diffuse channel is achieved. There's a lot of ways to achieve the normal, and AO channels with zbrush, nDo, or even just high poly 3ds max assets baked down. But the diffuse has me stumped. It looks hand painted, but I really like the subtle grunge effect everything has going. Can anyone point me to some photoshop tutorials that go over painting textures like this? Or if I'm completely wrong, can you tell me how these textures are made? Thanks in advance!