Well... a little more than a hand.... On my Ecuadorian girl now named Maria, I have added the rest of her teal colored clothing, the dark side of the box, and a hand. I'm still perfecting my skills on the human figure, but this looks okay all in all.
When selecting threads for the figure as in this hand here, I evaluate the painting closely before selecting thread. If I can see more than 2 values in the contour of the hand, I try to use at least 3 threads. Doing so will give you better contour in the finished product and also will be more interesting to the minds eye which 'tends' to like odd numbers of things ( eg 1,3,5,7 etc.)