I've been trying to play around with an old "Asari Shepard" headmod for ME3 found elsewhere, and my big problem is that the texture doesn't match what's in game (see attached).
Here's the raw files for the unfinished mod that I downloaded from mediafire etc rehosted for you to play with:
you can't change the color tints through the texture, it's coded into the default head. The alpha affects how reflective it is, it's basically a spec map.