thanks @furius the girl in the references as I recall was having a good time, but that sad eyes, and the frown wrinkling the forehead, I'm starting to find common especially when a ball gag is involved. I was looking for a scared face for this drawing, and the more lines in the face the better for me. I also wanted her to look like she didn't want tentacles to emerge from her mouth.
I too prefer to see happy people.