As a general blender knowledge question. How do i go about adding verticies on a face of a mesh. Say i have a skull, i outlined the basic shape and wanted to inset the eyes, but how would i go about making it so i can outline the eyes to move around without an edge loop. Because once i add a edgeloop the tri count goes up by a lot. As it adds more faces where i dont need them. If there a way around this, i watch blender speed modeling and i see people just create a square of verticies on a face and push it inwards. Would be incredibly useful if i knew a way like that.

Thanks, so far all my questions have been resolved, really appreciate it.