Beautiful Stonework!
Please enlighten us as to how you acheived the 3D effect on the upper-left corner of that stone wall. I've tried carving a flat piece of plaster, but the end result is always the same; a two-dimensional, obviously phony wall.
--> Does the original have to be assembled brick-by-brick to acheive the realistic look? I suppose that if one were going to cast lots of these walls, such a time intensive project could be well worth the investment.
--> I ask because this is one thing I really want to do a nice job of, as I expect to have a fair number of rough-cut stone retaining walls on my layout, as well as things like building foundations, culverts, etc.