Creating a tutorial. Need your input.

[Wired]

Can you expand the "few brush strokes in a half-circle" statement a little? I think you mean to do something similar to what you did with the mountains, but this phrasing could also suggest drawing a semicircle at ground level beneath the hill - and I don't think that's what you wanted, is it? You didn't do that on any of your example hills.

The river suggestions are good; do you think it would also be helpful to describe some common river geometries? Dendritic drainage basins, braided streams, or deltas? The details can get quite advanced, but many of our comments to beginners are related to river shapes.

I'll see what I can do.