Disappearing Head

[forgetcanon]

Alright, I've been trying to edit my Exile's head. I put a new eye texture on her in Adobe Illustrator, exported as a tga... and when I put it in the Override, she's headless. The TGA in question is here.

 

Why is this happening? How do I fix it?

 

EDIT: Solved! There's was some shenanigans with the alpha channel being black. Here's the finished product.