Thanks Gary and Paul

Brilliant effort on the painting, any chance of a walk-through of the colours and techniques you used?
Yes, the basic stone colouration is just a mix of caramel yellow-brown and flat earth, with various amounts of white added.
The weathering is mainly various shades of army painter ink washes, heavily watered down.
The rust is Vallejo Bright orange heavily watered down and mixed with a tiny bit of Army Painter soft tone.
The greeny tinge creeping up from the ground and in one or two other places, is just a very watered down wash of a medium yellowy-green mix.
The trick when weathering large areas like this (e.g. the stone floors etc) is to slap on some water, then use the brush carrying the colour to drop the wash onto the wet surface. It will then dissipate and spread more naturally. Once dry - after a couple of minutes - you might have to repeat - several times potentially. But it gives a very subtle result, much better than just applying a wash. It's a form of wet-blending I guess.
Meanwhile, I've built up the underlying ground contours using aereated fwall filler - this is basically just like icing a cake, although the surface doesn't need to be perfect because the final ground surface will be provided by a mix of PVA/sand/grit/paint. Small rocks etc will be added at that point too. I was going to build some big rocks in at this stage, but decided that rather than sitting on a crag (which would have required a much bigger base footprint) I just mount the tower on a nice grassy knoll

The colour is a bit squiffy in these pics. That's what comes of taking pictures in my red room of pain (otherwise known as the dining room

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