Painting painting - step #4

So here is more of the meat of the painting after a day or two of drying time. Again kind of a rougher process then usual but I've enjoyed the more straight forward approach. Similar to my drawing style the face is were I like working, I like the challenge, and the background is more of an afterthought. That's why with this of any other painting the face is done first.
I've laid down an extremely thin layer of walnut oil (non-alkyd) to give the feeling of painting wet on wet but without the messy mixing colors. The colors and draftsmanship are being tightened up at this point. And I am building up the lights, one thing I really like about painting in layers to build the hi-lights over 3-4 stages because it gets a really nice glow especially in good light. I've pushed the sky toward blue but wasn't comfortable with it so it will change.

My mind is muddled so if you have any specific questions come to mind please ask. More to come.
Also note, the step #3 image is awful, this is much better.