This is really quite simple.  I paint the things I like to study.  I stand in front of them and paint them.  I am usually drawn to a scene by aspects of light, texture, color, form or the juxtaposition of opposites.  Sometimes I will paint a subject as a sort of challenge to myself. I try to understand what is really going on or to try to capture an elusive visual effect.  When I am painting, I am not operating in a wholly conscious way, but in a sort of autonomous manner that is an escape from the left brain world of my professional life.  I get a lot of paint on myself. It's fun.