Very nice stone wall.  Some suggestions:

- Perhaps tone down the colour variation and degree of pitting of the 
stones.  In practice the stones would likely be quarried from the same 
place and would have less variation.  Still this is very pretty so make 
it a parameter ?
- A real stone wall would also need to be much thicker to stand safely
- The lintel would also have to be thicker (in height) and more deeply 
set (extending further beyond the left and right sides of the window space

The brick wall looks good at a distance.  In closeup I'd say that the 
mortar needs to be thinner and with a much finer pattern.  The brick 
texture looks smoother than in reality but of course adding the required 
roughness would be quite difficult.  I like the dirt / mold overlay.

I'd love to see progress so please keep us posted.

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