ZBrushCentral

Making Detail Terrain

Hi to all. I am working with zbrush for some time now, and i successfully manage
to do some models for private use and for company, but now i am in trouble. I get request to make detail environment, but i don’t know how to do that. I need to make a part of mountain in desert, about 25m high, and i need to make something like river crater that lava make it, about 40m long. On start of shot, camera will see all, and than, it need to slowly zoom to one part of that lava thing. I make all that of one piece, and now i have problem to detail it because i don’t have enough resolution on model. I get lvl 6 with 12m polygons, but cant go one more lvl, and on lvl 6 in zoom up it look very ugly.

Help me, plz, i don’t know what to do. I newer see any tutorial for making environment, so i don’t know how to do it.

What do you suggest me, how to make high detailed environment?

http://www.youtube.com/watch?v=4L1wDXNHQFk this help? not sure of your question