Hi Bette, glad you like the process
Yeah, I see what you mean - I keep having to guess the perspective now because my vanishing point was off the page, but I cropped the Photoshop document when I started doing values earlier. So now anything going that way is a guess-fest.
I shall see if i can amend that next time.
P.S. I forgot to say I changed the colours of the stone all round a couple of updates ago - it was to brown and soiley for my liking and need to be slightly cooler, so I 30% desaturated a dozen or so layers