I aint going to go on a giant crit spree becuase I see alot of stuff that has room for improvement, but overall its neat and interesting.

Here's some stuff you could work on however:

1. Like you said yourself, the ground map really isn't that great. Some things you could do to improve it is to simply add in more detail around where rocks and such are, that greatly add's realsim. Just try to paint flow of terrain and streaks for erosion. It takes a bit of time but can help. I also cant really tell but utilizing an alpha for multiple textures also helps.

2. The Water. This goes along with your terrain texture slightly - by adding a darker, muddier looking portion to your river bed it really draws out a better looking water system. You should also revise the textures used in the waterfall and stream - both look pretty low res and don't really help the map in being pretty. Another thing you can do is add a second layer of water on the streams using a water! shader (no fog, just no collision), which adds a nice subtle realistic touch to it with some waves. As long as uv'd right, this can look pretty nice. There's also some other water I can see, which would do quite nicely with fog.

3. Lighting needs vast improvement. Honestly, this map could probably look alot better during night time, as those giant pink crystals could bring out some really cool lighting, along with other affects you could add.

Some other minor crap; the leaves on the tree are neat and unique but the shader dosen't do it justice what so ever, there way to bright. Add some tree's on top of the map (like flat plane ones from a30), this will make it not as boring up top even though you have the giant rainbow things and hands going on.

Overall its an interesting and unique map but some polish could do it justice and make it alot more pretty.