Going through Leaky's FanArt Gallery, it is easy to notice that many fanartists have chosen the Hogwarts Staff for the topic of their artwork. Professor Snape, Dumbledore and Professor McGonagall are favourite subjects.

Wonderful montage by Hagiographer13!
Professor Dumbledore appearance in PS: "Tall, thin and very old judging by the silver of his hair and beard which were long enough to tuck into his belt. His blue eyes were light, bright and sparkling behind half-moon spectacles."
Hagrid is described in PS being "almost twice as tall as normal men - long tangles of bushy back hair and beard were hiding most of his face."
Professor McGonagall's appearance: Her hair is black and she wears it pulled back into a bun. She usually wears emerald green robes.
Professor Snape has in canon "greasy black hair, a hooked nose and sallow skin. His black eyes are cold and empty."
Elzora, however, has portrayed not only the major characters but also those staff members who we haven't met that much in the books - for example Septima Vector, the Arithmancy teacher:

You can check out Elzora's other works - all 21 Hogwarts staff portrait - here.
You can find the canon description of the teacher's appearance over at the Harry Potter Lexicon!





