I much like the clouds and the foreground, the path could maybe be
slightly more grey and less brown.  

The water needs reflection, maybe varying, might have a look at:
http://www.schunter.etc.tu-bs.de/~chris/waterf.html

The shape of the mountains IMO looks too uniformly smooth.  Since you said
you are using HF-Lab, i suppose you used fourier synthesis for generating
it. You might try some procedural patterns instead, but that of course
would mean building the whole scene new from scratch. 

From the shadows of the bridges i conclude that the light comes from
nearly straight above, maybe also try some other positions.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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