Well I figured out how to do the depths... sort of... for my outline

I've made the lower-lands have the darkest water, middle height lands with a mid tone, and the highest lands with pretty clear water.

The falls and rapids are much lighter, cause, really, it's not the falls, it's the spray at the bottom of those falls.

Now I just have to do the same for the land, and figure out how I'm going to draw and paint it

Click image for larger version. 

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Any commentary at any stage will be appreciated... I thrive on compliments, learn from critiques and really shape up from criticism!