Does someone know a few good places in Internet where I'll be able to sell my 3 drawings?

This is one of my works which I would like to sell.

"Leonie and Elmo"
Medium: Pencil / Prismacolor Colored Pencil on Green Charcoal Paper, Hooker Green / Burgundy Double Mat, goud Frame.
Dimensions: 13 5/8" x 16 3/8".