Should have stuck to smiley faces. Looks like a painting within a painting (or at least a frame within a painting.)
It looks like a thickening agent like Liquitex. They have a few gel mediums to thicken the paint to help create thick raised surfaces and peaks. http://www.jerrysartarama.com/disco...ign=shopping&gclid=CJav5bj818ICFSxk7AodpDoA5A