Matte Painting No. 2 (revised)

This is my second attempt at a matte painting. There are elements of this that are CG, photo and painted. This is somewhat of a work in progress but I hope you like what you see.

This is the link for the photo plate stock used to create this image:

[link]

comments are cool!

A list of things I want to change about this one:
Scene lighting is too flat.
many textures look 'soupy'.
sky and mountain integration not realistic.
clouds need to be tuned to bring out form.
no 'payoff' for following river up the mountains.
water is not to scale, surface waves are wrong and it lacks reflections/refraction.
want for horizon line to be 1/3 of shot. Camera reposition needed.

Please let me know what else will help this out.....

After revision I think I got most of the issues.