[Talon]

Good stuff, dude.

One other one point I'd add is scale.

Not just texel density, but the size of details on a texture relative to the mesh.

I see a lot of people doing photosourced texturing where the thought process must go something like "I need a rust texture. CGTextures > Rust. Here's the rustiest metal I can find. Copy/paste. Done."

And you end up with an entire burnt out car wreck textured with about 1 square foot of rust because they've copy and pasted a close-up rust pic straight onto the full unwrap of a car.

So, keep in mind that the amount of surface area covered by the photograph should be the same amount of surface area that the entire photograph covers on your mesh.