I was quite excited this week to discover a technique I had not used before.
1 - With masking fluid, roughly create some sky holes. (Gaps between leaves and branches in trees that allow the view of the sky)
2 - Paint your tree foliage
3 - Remove the masking fluid
4 - With a damp brush, soften the paint around the holes and paint over the top to produce a soft, impressionistic feel.
Not earth shattering