Creating rock cliff using ZBrush

A major asset in my scene is the water flowing from the rocky cliff. I noticed it wasn't very rock-like and needed retouching up as it brought the environment down.
From using ZBrush more recently i am more confident that i can create an improvement, which was very much needed.
So to start i will be taking a quick manipulated polygon from Maya and exporting it into ZBrush. I subdivided it equally so it divides nicely in ZBrush as well as extruded the faces inwards to define the basic shape more instead of having to sculpt it inwards.

To build up the surfaces to make it look like hard rock  i used the planar and clay tubes brush and then making sure the geometry was high i used the noise tool under surfaces to create fine detail. Once i created the high poly mesh i exported into Maya and then made a low polymesh using the decimation master.

Now using the materials in UDK i am able to create a mask with a base texture and a tileable diffuse and normal to create a detailed texture.

Using this newly created geometry i decided that it would look more interesting if i created a cave area above where the first waterfall is coming from and then suggests that the water is flowing from higher up.
It gives the scene a sense of size and is definitely captured when you have a character to use as reference for scale.