Completed shells

After the last scan and post of the shell piece, I started working on it again and decided to brush off some pencil crumbs with my little brush. Well, I brushed off more than pencil crumbs. Half the drawing went away. Thus, I learned that I have to be really careful when working on such a coarse surface, the pencil doesn't adhere as well as it can. I found a solution, I sprayed the piece with