
That is REALLY great piece of scenery, and that pool is absolutely fantastic, Ballardian!
I am seriously impressed!

If you want to add a little more to it I would suggest that you add just a little more scenic material to the rock that the tower is built on, just to break up the expanse of grey. It looks great as it is but, if you look at any natural feature, you will find that grasses and weeds etc will always find a nook or cranny to take hold of and seed.
The other you could do would be to vary the colours of the blocks of stone in the tower structure.
Thinned down washes of green and brown would work well here.
Just pick out the odd stone and give it a light wash, maybe one in five or six given a different shade. Mix the shades up a little, adding the green and brown together in different measures.
Pick a small area at a time to do and you should get a good effect.
Dont overdo it, though, as it is easy to create a patchwork effect.
Give the whole structure a light drybrush of the original lightest layer of drybrushing afterwards to bring it all back together again.
Another thing you can do, which is pretty easy, is to add a little growth to the walls.
Add a little scenic underbrush to the walls, particularly on the outside, and you will soon have a very natural look to a ruined structure.
Here is an example of the vine thing, showing how it helps to break down an otherwise plain area and give it a bit of 'life'.
http://leadadventureforum.com/index.php?topic=30667.165(Scroll down to the bottom of the page and have a look at the undergrowth growing on the side of the Undertakers).
This growth has been given a light drybrush of an Ivory tone to add extra depth.
Hope that helps.
