Limited proficiency in my view. The negro boy is somewhat handsomely painted, but the other figures look to be very amateurishly done...why the discrepancy?
In any case, I think the strife will lessen when the citizenry at large is no longer coerced into supporting art which is directed at the destruction and mockery of that same citizenry. In other words, when the art is allowed to stand on its own.
"Copied . . . from . . . photographs."
The flat perspective is a dead giveaway. He found some old copies of National Geographic in the prison library.
He has little if any proficiency. Almost anybody can copy from a photograph, given enough time (and he obviously has plenty of THAT.)