I frequently work from models. Most of the time this works out. I believe that you must find something about that person that is thrilling to you. In the case of "Mary in Polka Dots", I found the rhythm of her figure, with the long leg curling around to catch the support bar of the stool, to be intriguing. It also supported her figure....long and lithe....to aid in the composition. She represented completed freshness to me. It was a pleasure to paint her. I guess I see a metaphor here for life in general..........making the most of what is given to you. Painting helps me to understand all that is good.