3DFace.mat question

I just finished creating the 3DFace_mat project, it’s saved. I have been trying to make face masks and when I change the texture in 3d face, I can’t find a way to get it to fit my face. The mask applies to the 3d in a smaller version, not lining up the eyes and mouth. Can I get help for this and im not sure what to do with the 3DFace_mat project I completed. Any help would be great