Hi!
I've finally finished this. The mask was casted in silicone, not latex. I will have better pics soon, hopefully.
Here I have a photoshoped picture. It looks nice as wallpaper ^^
You can paint the silicone with more silicone!!! Grab some silicone caulking from a Home Improvement store. Tint with oil paints and thin with Naptha. You can brush on or thin to the point where you can get it through an airbrush. Then just seal it with a mist of just the caulking and Naptha over the whole thing.
Build up SEVERAL very thin layers of color to create a cool mottling effect and get some good shading in to make the details really pop! It's a great sculpt!