1. I felt that the spheres warm up helped me the most as it forced me concentrate on the values shade and light in order to give a convincing sphere look.
2. Composition is the placement of objects or subjects within an illustration. Value is the lightness and darkness of color in an illustration.
3. charcoal cons - messy and can be smeared pros - can be erased pencil cons - has to be sharpened if blunt pros - erasable pen cons - not erasable pros - refillable