Regardless of composition and everything, your linework is impeccable whump, and your illustrations are lovely! The falls are perhaps a little overdone, but not much and it's only really in the middle where the water hits the rock that it is a little thick.

What do you use to ink out of interest?

I'm looking forwards to seeing some more down on that page and with your re-arranged composition (from the initial sketch you posted anyway), once it's all inked in, it might work quite well still. But as I say, regardless of composition, it looks amazing so far.