This is a small 19 x 17 life study I did a couple of months ago. It was painted alla prima. I used poppy seed oil to keep the paint surface very wet while my model posed over 3 consecutive days. There's an effect you can get when paint is still wet that is just not possible after it has dried. Namely being able to move everything around in one layer and fuse edges together...or smearing and dragging paint layers. The light source was from daylight balanced florescent photo lights, which give off a nice enough color.