A coup of coffee after New Year's Eve

As we were up until late night to celebrate the turning of the year, I had a coup of coffee late. Being inspire by that I took a photo with the intention of painting it for a small study of the hand.

As the background is not important, I have focused on the light and shades less on the exact hue. My aim with this study was to make a credible rendering of the shape of the hand holding the coup.