Leonardo da Vinci's Rare Anatomical Drawings | Brain Pickings| Brain Pickings: An anatomical study of the principal organs and the arterial system of a female torso, pricked for transfer. Description from I searched for this on
Introducing artist, Jennifer Healy. her pencil portraits look like a day dream! - has the best funny pics, gifs, videos, gaming, anime, manga, movie, tv, cosplay, sport, food, memes, cute, fail, wtf photos on the internet!
I never use colored pencil but this is a great tip. Use an offwhite paper and suddenly your accents can stand out. Or you can always just color everything off white (sans the accents in the eye) but that would take longer.