Problem
I'm brand new to Fluid Mask but I was very excited by the possibilities of what it might be able do, so I decided to give myself and it a real challenge. I was at a local park with my camera and noticed that the sky behind some oak and pine trees was a fairly neutral cloudy/blue. I shot one photo with the intention of seeing how well Fluid Mask would extract the trees...
Solution
Then I moved the finished extraction on top of a pre-existing photo I had shot of a California beach sunset. Before I started the extraction, I made a couple of layer copies of the photo and so all I had to do was paste the sunset into the pile of layers and move it into position for the sunset to show up beautifully...