Artist doesn't use eraser

Last weekend we went to Shilparamam where I saw some artists, one of them drew my picture with a pencil. I am reminding my father to upload that picture to the computer and put it in this blog, but he is forgetting everyday. Here is the photograph my father took while the artist was sketching my picture. One thing I was wondering about is this artist used only one pencil without eraser, he didn't even use it once.

My father appreciated me for sitting (for 20 minutes) without moving or sleeping, I was so curious to see the picture which kept me away from getting into sleep. We discussed about drawing mother's picture like my father did some months back, we will do it again.