I had sketched nude and clothed models for 3 years. The positions that I find really challenging and yet beautiful to sketch are poses where the torso is twisted.
I had a model that did 2 minutes poses for me, with a chair. Most of her poses allowed her to lean her weight onto the chair instead of fully on her feet, which I think really helped with the fact that she was posing for 3 hours, from clothed, to naked.
The fact that it's an art class, you will normally have students sitting all around the perimeter of a raised stage. Remember to keep your poses going at a full 360. Everytime you change pose, think of the students who were sketching you full frontal, make sure you rotate yourself so that they get a different angle. Simple things like resting one hand on your waist, the other touching your butt, hugging yourself, twisting your torso.. these simple movements rotate your abdomen, and all the different planes every limb is on.
Students are looking for lighting and shadow to define shapes. The more you twist your body, the more challenging it is for them to find muscle definition that do not normally show when you are just standing straight.
Bring props if you are allowed to. Lots of poses to come up with if you are holding a stick, a ball, a ... pail. You can hold these things, up, down, side, back. Most art classes have a stash of props that you can pick from. Find things that allow you to hold, yet rest on. For example, a pail. You can hold it up, down, or rest a foot on it... you might even be able to sit on it.
I'm rambling. I hope some of these points help. Good luck, and have fun.
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