Fantasy Landscape with Boater: 19th Century Sandpaper Drawing, Framed as Found

What an interesting array of folk art picture making techniques there were in the 19th century, sandpaper drawings perhaps the most curious of all. Instantly recognizable, they were made using a combination of charcoal and marble dust, typically applied to a sandpaper-like surface, with the marble dust lending a sort of silvery sparkle. This is a quintessential example, with wonderfully dense, fluttery and silvery foliage framing a river view, a tiny boater at center and sun rising, or setting, over fantasy castle on the horizon. Plus this curtain of pillowy dark clouds overhead. framing the view. Framed, as found: 17 1/2" x 15 1/2". Visible drawing: 11 1/4" x 8 5/8". Some glare in photos. Drawing in very good condition. Frame and mat are newer, but not new, both in good condition. There are a few patches of imperfection to the glass, minor.