An Upside Down Flipped Grayscale

Done as part of a 1 hour class.

My current goal is: Draw facial muscles and expression muscles precisely without any underdrawing.

Here is another drawing that is flipped and in grayscale of a woman happy, who shall be nameless. So what do you think? Do you think I did a fantastic job on drawing facial and expression muscles precisely-like, without any underdrawing, even when flipped and in grayscale? Like, Comment, and Share, Please.