This is the second layer of umber and white oilpaint.
The underlayer must be painted in very light tones, so when the transparant color layers will be painted on top of the underlayer the light will shine through.
And it looks like the painting is glowing from the inside.
The second photo looks more crispier and not so flat anymore.
Not easy to take a picture of though.
The different tones are so subtile and the photo looks on the screen a bit too harsh.
I have particulary problems with painting leaves so they are still in an early stage.