There are no real shortcuts here, the only thing to do is to learn how he body works and moves. When I work on a pose, I spend quite some time in front of the mirror moving my on limbs according to the poser dials to help me get a feeling for the pose in question. Schlabbers poses are excellent, study them and move your own body according to them. That will give you a feeling how the pose dials corresponds to real body movements. Also remember that most poses are snapshots of movements. Many poses I see I see in Poser pictures looks like the person is standing still, even though the creator wants to give the impression of movement. Always try to picture in your mind what the pose will look like if the render was done a fraction of a second later. Try to capture the pose so that is looks like it's heading in that direction, try to get the feeling of the movement.