Water looks good to me. If you want bigger mountains then scale them up. Edit - transform - scale = 200% (for example). This gives them a bigger "footprint" and you will also have to readjust the bevel numbers. Stacking works sort of like bump mapping and makes them look taller as does fiddling with the bevel. You could also duplicate the mountains layer, and then get rid of the layer styles on this second layer, then set this second layer to overlay. Overlay mode, and stacking this layer a few times, darkens the darks and lightens the lights producing a faux exaggerated height.