do not ask too much
Do not ask to much but take the chance to DO. If your model is going to arrange herself, taking a new pose, do not ask, to not say a word which can give negative response or simply make her insecure. ACT ! Do and show her what you have done afterwards.
This picture above is done while she was moving on her sofa, arranging. Instead of asking her what she is doing there i took pictures of just that moment :)