How to add faces to rthro rig?


Hello, I am making a rthro blue lock game
My I’m currently trying to add a face to this rig which is supposed to be the player but I have ran into a few issues. Because of the head shape, I can’t just use a decal. I need to customize the position and size of the image. Using surfacegui or a invisible part doesnt work because they dont wrap wround the face, and although textures would work, their size/pos isnt customizable as textures on meshparts modify the parts texture. After researched I decided to try using a surfaceappearance but it lacks what i need with size and position. How would I add a image for a face on which I could pick the size or position?