mmm, idk...i think its more the detail of the rug, the shadow of the plant, some light source reflecting over the couch, the way he gave the couch such a comfy plush feeling with a few brush strokes...how if you look every line, every stroke, seems almost careless because his eye for light and form is so phenomenal, he doesnt need to second guess or overwork it.

i don't think many people can appreciate how amazing this picture is.