Oh yes, beautiful watercolor painting
well done david and eric! I especially love it how trees come out so "realistic". Fotosketcher does a really good job on dwc.
marvins_dad, fotosketcher has no layer system for blending, you need Photoshop or something alike.
This inspired me to make a test if I could use only SketchUp for line overlays. (just to prove myself wrong by finding a workaround to get it done without PS)
It is not very convenient but it works ok to use the watermarks as layers. Bring in two images of the same size as your SU window, one Twilight render (pimped in Fotosketch if desired) and one lines only Sketchup export. You just have to overdo the color and contrast on the render, because transparency is the only blending option and the white of the lines export will take away a lot of color and contrast.
So what you see here is a SketchUp output not showing any geometry, only watermarks (just a test, branches look strange, model is from 3dwh).