Looking good.

I think your texture bump map is swamping your mountain shadows a bit. Have a look at this area as an example:
asc1.jpg

The shadows make it lok like the river is running over hills rather than between them. To sort this out you might want to really emphasise the mountain shadows. I took the liberty of doing a quick overlay to see what it looks like (hope you don't mind!) to get this:
asc2.jpg

Here's the overlay - as you can see it's really not very smooth or carefully done!
ascOver.jpg

Hope that is useful.

This is a great map - I'm glad to see your style continue to get better. Great stuff.