Thanks guys! Gary and catherine, I tried rotating the terrain while I was painting, the brush still only points one direction. It seems like brush rotation would be a really helpful feature, maybe they'll add it in a future version. The shadows are harsh, for my final renders I'll bump the quality up alot. I think I'll export a greyscale terrain map and then place a load of footprints all over the place using the map as a guide and then use the brush to "stamp" all of the footprints into the terrain in one go. I might even make two brushes, one for older more subtle prints in the dry clay and newer and crisper prints in the mud. If I play around with the hills enough they will look good eventually, just can't seem to find a good material to represent bare grey limestone.

The final challenge will be to get this guy into the scene, I suppose if I load my vue scene into maya (I'm using xtream) I can just do it from there?