I did not know those shirts were also called that. Awful name for a shirt many of us use, at least from time to time. I thought music lessons would not be something done in a few seconds, as it is in the game. They would need to stay around a week, at least. So wanted to portray the team in different clothes than what they wear in battle.
In Yousis's case, that means just taking off his outer uniform, and leave what is beneath. He would also stop shaving for a few days. While, at 21, he definitely is a "man", 21 is still young enough to be "boyish". So this is not a "5 o'clock beard". This is all he gets after a couple of days. That is why I focused on the chin, with no moustache and just a few hairs in his cheeks.
I will try to include Amia in another pic, wearing something that displays her attributes in a more flattering way. Besides the rush in all the three (or four, if you count the Motavian) most-background characters in the pic, which made me draw them all as simplistic as I could (okay, perhaps I paid a little more attention to Huey), I chose to give her sweat pants (and not form-fitting ones, at that). I have noticed that those type of sweat pants are not "polite" to the body they cover, changing its apparent shape to all viewers.
I realize now this was unfair for all of Amia's fans (and fans of female fan service in general). I will try to include more fan service for both sides in the future to make up for Amia's bad choice of wardrobe.
But do not be mistaken, below those pants, her legs and bum are very well defined and more on the round and firm side.
Edit: You can see her upper body. She is wearing a thin and soft shirt, so you can see how much rounder and firmer her torso is compared to her lower body. And I can tell you, I am working in a few more pics for the future (and I may have a little more free time now to actually finish them), and in one of them you can see a very curvy Shilka. I will see if this one can be the next I finish, just for you all.
Another edit: This is the type of pants I had in mind, not very fan-service-y at all. For that, I apologize.