I saw this technique on WetCanvas. The process is to sketch and then mask the sketch. Apply gesso and texturize it. On the Christmas Cactus, I sketched the blossom and leaves and then masked them. A light coat of gesso was applied to the background and using a 1" flat brush, I brushed in a cross-hatch pattern. The gesso was allowed to thoroughly dry. The background watercolors were applied and allowed to dry. The mask was removed and the blossom and leaves were painted. I didn't think the textured gesso was as prominent as I wanted so decided that two coats of gesso would work better. On the grass with yellow flowers I sketched the flowers and then masked them. I applied two coats of gesso, combing each coat with a plastic hair comb with the intent to have the texture look like grass. The sky was then painted (and here is where I goofed -- too dark on the blue and it wouldn't lift very well). I removed the masking and painted the flowers and leaves. I like the gesso on this one - it turned out just as I wanted. This is a fun technique!