commissioned painting 'Joyous Nude'

I was recently commissioned to do a painting with the words 'Joyous Nude' in mind. I made the canvas stretcher in the wood workshop and stretched the canvas myself. I used my sister as a model which is why I have blurred out my reference photo    
                                     

I often hold my painting up to look at it through a mirror. This can give me the illusion of fresh eyes; seeing it from a different perspective to see what can be done to improve it