Martinho Corriea on the subject of first painting. The first step is oiling in the painting from the previous session. This is done with a 50/50 mixture or turpentine and linseed oil. This stage is where largest forms are modeled in the round. For example treat the leg as a column, but also pay attention to the fact that there is still the fall of light from the previous session. The torso becomes a rounded mass and you still work with simple light to dark and a large brush.
I took a lesson and stuck my reference much closer to my canvas.