Cat Girl

Equations:

Contour lines:
(16*x^4 + y^4 - 16*x^2*y - 0.1) * (x^2 + (y - 0.5)^2 - 1) = 0.25
(16*x^4 + y^4 - 16*x^2*y - 0.1) * (x^2 + (y - 0.5)^2 - 1) = -2.5

Eyes:
(abs(x) - 0.5)^2 + (y - 0.75)^2 = 0.25^2

Pupils:
(abs(x) - 0.5)^2 + (y - 0.7)^2 = 0.06^2

Nose:
x^2 + 0.75*(y - 0.1)^2 = 0.1^2

Mouth:
x^2 + 8*(y + 0.25)^2 = 0.1^2

Whiskers:
y = sign(x)*(x - 0.55*asin(x)) - 0.025
y = sign(x)*(0.9*x - 0.8*asin(0.9*x)) - 0.025
y = sign(x)*(1.2*x - 1.1*asin(1.2*x)) - 0.025

( Mathematical software used: Graph, GeoGebra )