These are relatively old paintings I just found in a sketchbook I left at my parents house, when I went back over the Thanksgiving holiday.
I used to like pause movies on my dvd player and make really quick color studies. It probably isn't good for your dvd player, but I found it to be a really great exercise in learning how to paint color keys. It also helped me get more accustomed to painting in different color palettes. This study is from the opening sequence of the Godfather.