Art, it's too blue. Check out some "YouTube" help on the internet - many great resources. Most suggest darker colors such as black, browns, tans, olive green and maybe just a hint of blue. Too much blue doesn't look much like a river. Your layout is really taking shape - the arch bridge is a masterpiece, but I can also say that about most of the other scenes and structures you have. Really fun to see the landscaping take shape.
Dave
