For my self portrait I used a lot of parabolas, hyperbolas, linear functions and a few ellipses and circles. The parabolas were used in my lips, face and hair, hyperbolas were used in my hair and nose and linear functions were used for my neck, tank top, face, eyebrows. The circles were used for my earrings and eyes as well as the ellipses. I used these functions in specific places since they reflected my features the best. To make sure my functions followed my photo reference I used sliders to help me accurately place them. For my graph I made custom colours to represent my hair and skin tone so the results had more resemblance to me.

https://www.desmos.com/calculator/qvuhg9oy4y