The cocoon or the bug? Well, in this case, the chrysalis. I used Adirondack Copper mixative on the bark of the branch. It has great texture that works well for this type of application. When the inks were dry and the frisket film was removed I went over everything with a wash of Da Vinci green gold fluid acrylic thinned with a little water and let it puddle and dry. That produced some nice texture in the background.