Your drawing and placement look really good. Continue to make sure you really try to separate shadow from my and make it obvious. And after you’ve done that, you can start to play with adding some vibrating colors to the skin tones so she doesn’t look monochrome.

so, from your drawing on the board I can tell you are very good draftsman. What we need to do is keep that excellent eye you have in the painting process. I don't see enough squinting observations at this point. every stroke needs to have the same level of observation that you put into that excellent drawing. The extra problem is adding tone to the mix. Think of your brush as a piece of charcoal . Photograph your painting with your phone and turn into a black and white. Now judge it as a drawing and change what you would change if it was a drawing.