POSES TO TRY

1. Experiment with different facial expressions. When it comes to your visage, make sure you get some variety in your shots. Have some looking directly at the camera, some looking away, some smiling and some serious. Also, try not to blink when the photos are being taken!
You don't have to stick with the feel of the scene. You are totally allowed to be frolicking sadly in a meadow -- it could lead to dynamism and a greater message.

2. Work with poses that are just the torso on up. The photographer can either cut you off at your midsection for a closer up photo, or you may have a surface in front of you blocking the rest of your body. Work with this in a number of ways.
Turn around and look backwards over your shoulder. It's very simple, but it can also be evocative.
Play with your hands near your shoulders or face. But remember the rule: only show the sides of your hands! This continues the line of your arm, making them look longer and leaner.
Lean forward slightly. This, when done well, can look candid and emphasize the curve of your body. Since you don't have the entirety of your shape to create the "S," allude to this by leaning forward slightly, invitingly.

3. Master the full body pose. With your whole form on camera, you have loads of options when it comes to posing. Ask your director what he/she is looking for and narrow it down from there.
Turn slightly and put your hands in your back pockets. If you don't have back pockets, place them where they would be if you did. This accomplishes another rule previously discussed -- leaving space between your trunk and your arms.
Support your back against a wall. Throw up the leg closest to the camera and rest the foot on the wall as well. Don't put up the other leg -- you generally want to keep the outer thigh exposed, not the inner thigh.
Move your hands up and down your body and slowly twist side to side. Full height shots are hard to do and you'll want to keep a constant curve and natural flow. Consider raising your hands above your head, too, for a rather sensual pose.

4. Use the ground. Just as you have a plethora of options while standing, you have just as many on the ground. And you may be more comfortable!
Place your hands behind your back, resting on the ground and throw out your legs, with one knee slightly up. Throw your head back a bit. The long line of your body will create a nice angle and shape.
Sit Indian style, but pull up one knee to your chest. Wrap your hand around the leg closest to you and tilt your shoulders and neck. Clasp your hands together just past the view of the camera.
Sit on the ground, but on your side. Throw one hand to your side and one arm resting loosely on a bent knee. Place the foot of your other leg at the heel of your foot that is resting flat on the ground.
Regards.