Brad's Art School: Learn to Draw for beginners https://www.youtube.com/watch?v=Wz6DrQeQ5rI
Drawing Faces: https://www.youtube.com/watch?v=gT5zBXuKO3I
Drawing Eyes: https://www.youtube.com/watch?v=44OOmG72cH4
Shading (Value): https://www.youtube.com/watch?v=-WR-FyUQc6I