How much can you do in 15 minutes?

Here is my favorite model, Senalka.  She has  a great presence:  strength and sweetness, both at the same time.   For this 15-minute pose, I concentrated on the face.  A lot can happen in 15 minutes.  Now, I work on a painting from the sketch.  As always happens, the sketch is so much more satisfying.   I ask myself the question then: why paint?  Why spend hours on a painting when I love the drawing process the most?  Why?  People take a painting so much more seriously than a drawing.  Perhaps I should break free of painting altogether for awhile.  But first, finish the one I've started.  It is for an exhibit, after all.