Add a thin layer of Derma Wax on the area around the artificial eye.

DERMA WAX = Derma Wax
By scraping it out, you already make the texture a bit flexible.
You then make the wax easier to model by applying it to the ball of your thumb and scraping it off again with the spatula two or three times.
The wax must be flexible but also firm and must definitely not be allowed to get too soft and sticky.