This is already looking quite good and interesting. Apart from the comments 
already given, I think you should consider critically the random selection 
of your starting point. If you look carefully at your images, you will see 
that sometimes a rivulet starts on a ridge and flows down more or less along 
a ridge, which is unnatural of course. And rivulets start sometimes just 
beside a natural indentation of the surface, instead of starting in the 
indentation itself. This is a kind of chicken-and-egg conundrum of course as 
a rivulet creates an indentation which in turn attracts more rivulets etc. 
Still, I think you should consider the "randomness" of your starting points 
as you start already with a fully formed landscape in the first place. This 
means that the starting points cannot be random at all.

Thomas

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