Oh, so these are feet. So the whole area is only a few hundred yards across. At that scale I would expect to see lots of creeks and not a bunch of streams/rivulets. The thing that strikes me, then, is that they have a pretty similar width (roughly 30 feet across) - not that it's wrong or anything but maybe make one thick, one thin, and one medium with a bunch of hairline streams. Personally, at only a few hundred yards I'd expect to see far fewer streams/rivers/etc. unless this was a swamp. All that said, if you like it then go with it. I'm just offering up opinion and there's no real right/wrong here.