Look....i rate 10s anyway to be nice....but its horeshit when the author deliberatly tricks us in symmetry.....the head is symetrical around.....then the inside of the face is symmetrical but shifted to the left 1 square to those wanting to know.
If you solve by logic without assuming symmetry, the puzzle is relatively easy to solve. The last portion of the puzzle does have multiple solutions though; assuming symmetry helps find the correct solution in this case.