Click on the image on the right to see the entire sketch at super-high resolution.
Below are my comments on specific details.
This model was in better shape than anyone I've drawn. Or seen. He must have 1% body fat. The girls in the class were happy. The guys were intimidated.
Nevertheless, most guys are shy and choose poses in which they can cover their genitals. Here, it's kind of hard to see how his hand is resting on the stool. (By contrast, we saw one model who was bold - to say the least - and he was eager to strike many embarrassing poses.)
I like how his foot curves around the stool here, as well as drawing the perspective of the stool itself.