This photo ref was one I used recently for a painting on regular watercolor paper. I'm trying to get some detail on the layered Yupo and find that if the layers are thoroughly dry AND if there is the correct ratio of water to pigment (it's about the consistency of thick cream) then fine lines can be laid down without lifting the under layers. The roof on this was too thick and I couldn't get it to develop into interesting texture by spraying it with water. After accidentally lifting too much pigment off and having to re-layer, I dabbed it very lightly with a waded piece of tissue. At first I didn't like the effect, but now that it is finished I think it made it look aged and I DO like it. Here again, I'm using the DS watercolors and the shack is primarily painted with the new Goethite that is part of the Sand and Surf Triad.