Adding a facemask with the original face - over another facemask

If I added a facemask - and then wanted to use the original face directly from the phones camera - to use a blendmode to make the features of the face clearer
- how would I do that?

If I add another facemask - and check the Orig.Face Index - the input will be the face with the facemask on - and I need just the facial features - without the first facemask.
.
If I add another camera, make a camera output and use that as the texture - it wraps the whole image around - and repeats it in a loop that adds smaller and smaller faces ont the face - in eternity.

How should I approach this? What is it that I do not understand.