Since Ethan is so into art, I decided to read more about it. I found a very helpful article...
http://www.babycenter.com/refcap/toddler/toddlerdevelopment/12573.html
DRAWING AND SCRIBBLING
Sometime between the ages of 12 and 18 months, your toddler will probably attempt to "write" by making marks on paper, and sometime between 18 and 24 months she may surprise you by drawing vertical and horizontal lines and perhaps a circle. Applaud these early doodles, which encourage a whole raft of new abilities: Drawing with a crayon involves fine motor skills such as grasping and holding, for instance, as well as boosting your child's visual acumen and tapping her imagination.
Set up your budding artist with big sheets of thick paper taped to the table — after all, nothing inhibits creativity like a dismayed shriek from Mom when the crayon slides onto the tablecloth or rips through thin newsprint. Thick, sturdy crayons or washable pens in a few primary colors (so as not to overwhelm) are a good choice. If your toddler isn't interested, offer some alternatives: chunky sidewalk chalk to use outdoors, paper pinned to an easel instead of a flat surface, or soap crayons in the tub might pique her interest.
And don't forget finger-painting. While learning how to hold and manipulate an implement is important, finger-painting gives your toddler's fine motor skills and creativity a workout, too. If she's tired of paints, try printing. Hand- and footprints on paper makes great gift wrap. Or tap into her interest in nature and brush leaves, acorns, carrot-tops, or flower petals with paint to use as homemade stamps. For a special treat, let her finger-paint with pudding or brightly hued fruit juice — she'll exercise her motor skills and will have fun licking her fingers.