I didn't write this. But it's very useful when writing an application to know some good describing words.

Face

Oval
Heart
Square
Box
Egg
Triangle
Round
Diamond
Quadrangular

Chin / Jaw

Sloped
Pinched
Square
Cleft
Dimple
Double
Rounded
Rugged
Pointed
Butt

Forehead

Wide
Creased
Smooth
Raised
Flat
Billboard

Eyes

Oval
Round
Slanted
Wide
Squinted
Almond
Long Lidded

Nose

Hooked
Crooked
Broken
Slanted
Sloped
Pointed
Stuck Up
Smashed
Button
Flat
Wide

Mouth

Plump
Pouty
Top Heavy
Bottom Heavy
Wide
Thin
Lined
Cupid's Bow
Crooked
Swollen
Pinched

Teeth

Perfect
Crooked
Chipped
White
Yellow
Gray
Fake

Cheekbones

Hollow
Round
High
Low
Smooth
Rugged
Drawn
Plump
Baby Fat
Tight
Pinched

There are also some general descriptive words you can use relating to animals, deriving from Latin-

"equine" - horse-like
"aquiline" - eagle-like (often used to describe hooked noses)
"leonine" - lion-like

I know there are more.