4 stitches up from the mouth and 2 stitches to the right sew a French knot for an eye. Do the same 2 stitches to the left for the other eye.

Two stitches up from the mouth with pink yarn sew a French knot for a nose

Sew a running stitch around the edge of the square. Place the bottle cap with poly fill facing up against the back of the face on the inside. Pull your yarn to gather and sew to secure.

You should have a head like this last picture