This photo was taken as soon as I finished drawing my son with Charcoal. I already drew my daughter a while ago, so this was to match the other one. The edges were clean, once I pulled the masking tape up.
When I sell charcoal portraits, I charge a flat rate of $60 per child pictured. For example, one drawing of twins would be $120. The rate is based on the amount of time it typically takes me to draw one face. The supplies (charcoal and paper) are included in that cost.
Shipping costs (if not local) would be additional.
All I need to get started, if you or someone you know is interested, is a photograph to work from.