Hi guys, thanks for all of your comments - the rugged, desolate look was what I was going for originally. However, I have returned to it and added some trees (Lightning's Common Ash) and a nice bush in the foreground (again, courtesy of Lightning). Basically I inserted the bush in order to hide the area on the left where the imagemap didn't appear to be as high resolution as I would have liked.
I'm really happy with the feel of the image now, it sort of reminds me of areas of north Yorkshire - I think the trees add a better sense of scale and make the image alot more interesting. I have to say that Lightning's trees are fantastic, so if he's reading this, please acceptmy deepest thanks!
Inscrutable