These are 18" x 14"
I had no charcoal or decent sized paper. So I used the back of an old Anne Geddes calendar and some really crappy wax crayons. The paper was really slick and nonporous so after sketching with the crayon II put a little 'Zest' orange solvent (like turps) on a cloth and with my finger I was able to blend and clean up some of the lines. That was really fun!
I will experiment some more with this so don't throw away your old large format calendars that are blank on one side, please send them my way!