Don’t get stuck in the same pose for more than three seconds. Three seconds?!? Yeah, and even that might be too much.
KEEP MOVING. Slightly tweak your pose by moving your shoulders, angling your face differently, repositioning your arms, legs, etc. It helps to think of modeling as a sort of dance. Keep moving, keep flowing.
Be aware of your hands. If you have claw hands or are making an awkward position with your hands, RELAX.
Keep your hands graceful and soft whether they are on your hips, or hanging loose at your sides. Don’t clamp them at your waist or make tight white knuckle fists–your hands should always stay light and smooth.
You must have good posture. Modeling is all about positioning your body in flattering angles and interesting shapes, so it’s important to have good posture to begin with. I’ve never seen a successful model who hunched all the time, have you?