

If you don't plan on using a photo background and want to try an easy, inexpensive way, this is it. No artistry required, just brush from left to right . It 's impossible to screw up....but don't do what I did; repaint after scenery is in place...what a pain.
For distant green fields I used an acrylic green and mixed it with the sky color. This immediately imparts a haze to the green.
Overall it's a subtle change, but does add the depth I was looking for. Give it a try.