Adding makeup customizations that don't take up texture slots is always a plus, in particular when you can further alter their composite texture elements (gloss/spec/diffuse/alpha) without affecting the model at large. More efforts like this would be extremely welcome!
I have only one nitpick, and that's with the eye makeup dipping a little too far into the far eye corner. However, I also use cartoonish eye morphs that exaggerate the effect with their unrealistic size, so with some alterations I might be able to erase the issue.