According to the X-files the Krisss is the most dangerous of known aliens. The only one in captivity is kept in a solid stone cell and can only be viewed through a granite rimmed armoured glass porthole.
In GIMP Iwarp with move tool and grow tool to distort face. Colourised saturated and lightened. Circular selection inverted and filled with a stone pattern. Inverted selection again and stroked with granite pattern.