The canvas was big, rounded, and some lines were already there and couldn't be erased. Still, this didn't stop Michelangelo's creativity.
He grabbed his brush and let his imagination flow, painting the exact reflection that he had in mind.
It was done. And it was beautiful. However, the artist's reward was a hit to the back of his head, because the canvas was a shell. A shell that a very grumpy turtle wore, a red mask around his eyes.
The angry turtle clearly didn't like the art, but Michelangelo always appreciated every kind of critique in any form.