Wow! This is really something! I scanned it in at a higher resolution so you can appreciate the color change from side to side of the piece. Exquisitely done, I think that it's chalk; but then it's covered with some sort of laminating material..... very glossy. Best viewed at 'Original'.

The lamination made this a tricky one to scan at high resolution so I used an old photography trick to filter out the glare. Can anyone guess what I used for a filter?