Your linework and clarity are impeccable as always. I also like the textured treatment on the background, it's a nice way to give it some visual interest without getting overly complicated. The lighting and definition on the figures is also excellent. Even though all four of these guys are basically the same body type, you've managed to give them some subtle variation in shape, body hair, skintone, and even specific muscle definition, which I also appreciate.
As for negatives, I think that the blonde man (I will refer to as #2) on the left has one really long arm. If you look at the fellow on the right (#5), his left arm (screen right) and the right arm of #2 (screen left) are holding their numbers at nearly the same height, but #2 has a lot more bend in his elbow. Thus, if he relaxes his arm, his hand is going to reach to his knees.
Your hands are gigantic from an anatomical perspective (an issue that I struggle with myself, and may or may not be a concern for you)
Lastly, I find myself bothered by the face of #0. Mostly his mouth being so close to the contour of his jaw. Maybe this one is just a personal preference, but it feels out of line with the degree of realism presented elsewhere in the figures.
Overall though, it's a really fun piece. It's a pleasure to see a piece of work done by someone who clearly admires the male figure. Thanks for sharing and Happy New Year!