In this video he just draws a simple picture of boo. It maybe takes two or three minutes to make the sketch. First you just draw a circle roughly, and add ears to that. Next add tongue which is very long and outside of the mouth. You just have to give importance to the teeth in this drawing to make your sketch great. Next you just add teeth, which is wide. Next make the teeth highlight. Next draw two small circles like eyes and highlight it with the pencil. Next make the rough sketch into the fine sketch and outlined the picture with the pencil. Next add shadows to the sketch. Then your picture is ready.