So now moving on to fake rock trials..tricky lil buggers LOL!
I like it. They have good shape, which is sometimes difficult to achieve. Water is a nice addition too.
Have you considered more rock layers with different sizes and colors?
Nice start and yup, tricky lil buggers....check the clip in this thread Clay.
http://www.planetside.co.uk/forums/index.php/topic,18824.0.html