https://www.desmos.com/calculator/fjc7xwnszj

I used a variety of functions such as eclipses, circles, hyperbolas, radicals, linear, etc. as I deemed necessary to create the most impact possible. I noticed my face shape and eyes are a little sharper than usual, and not very round or circular therefore I used radicals and exponentials a lot. I used circles, hyperbolas, and eclipses for the eyes and very obviously circular shapes to get the round effect I wanted. And lastly, for the rest of the simple shapes, I used linear functions. Restrictions improved my graph tenfold and it could have never looked this way without it, not even close. The only thing I felt I could improve on was shading, however, after trying it out for the whole face I decided it did not look good enough and was better off without it.