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Ah-ha! I used a dark and a light grey, instead of black and white, it was too much b/w, but the effect works like a charm. A bit of a gaussian blur over the centre, and I even have a ridge line for free. I am well impressed.

Made this building layer a little opaque as it was far too bright before too, dropping to 80% has grounded it a bit.

Also the cobbles now look a bit more natural I think. A texture and some black overlays and it's coming along. Just a few more building and some tweeking to go.