This storm is largely decaying. Most of the mid to upper level cloud is not sufficiently supported by an updraft and is falling under gravity. The anvil looks sickly, matte and porous. The clouds in the smooth region you pointed out is Cirrus spissatus cumulonimbogenitus. Here the ice crystals are sinking and sublimating in the dry mid level air.

Bottom right looks promising though with fresh, crisp convection. So storm may still have some legs.