I drew my face while thinking about which functions to use to make the face look more realistic. I basically used hyperbola and applied appropriate restriction to x and y to smooth out the curves of the face. Functions of hyperbola can be used to create two kind of graphs which are symmetric with X axis or Y axis, so I carefully considered which one I should use. The eye bolls are made using a circular function, and sometimes I used sinusoidal function to make lips and frames of eye to do this project efficiently. It was a good idea to use sinusoidal becuase it was less work than making multiple hyperbola. I used a total of 77 function, and I put color using RGB values to make more beautiful. I set each number plugged into the functions very precisely, striving to get as close as possible to my real face.