What term is used to describe a visual texture that simulates reality so accurately it can fool the eye of the viewer

To create this piece, the painter used his/her fingers and fiber brushes to apply reddish pigment made from a. (1) horse tail; (2) basalt b. (1) yucca; (2) iron-oxide c. (1) animal; (2) sulfur d. (1) cotton; (2) charcoal