What everyone else said :-). To neaten up your river setup, once you've read up on that tutorial, you may only need to break some implausible stretches, not do wholesale rerouting.

I like how you're effectively suggesting mountains with only sketched linework. Maybe going back over them with a real light coming from the highlight direction would suggest where you could slap in some more shadows. Try splat, splat, splash; messy as need be, and then dial them back to a light percentage opacity, and the sloppiness won't matter.

As far as fonts - variation is fine, to designate different feature types. Trick is, one uses variants on just one or two typefaces. Plenty of possibility between size and variations like caps, small caps, italics, cap italics, s p r e a d o u t, normal... For some reason, family variations are more harmonious than bunches of distinct typefaces, no matter how pretty each is by itself.