A nice start - do keep it up. You're right - that expanse of river is ideal for lots of annotation. Think though - is there a reason you need to show the opposite bank? Are you going to depict anything there? If not, you could accomplish the same thing with an inset overview zoomed out 10X or so.

I like the shacks tumbled at the bottom of the hill. And the way some of your citizens have brightly painted roofs. I'd tone down the intensity, but that's just me. The street grid is awfully regular, compared to a medieval earthly city, but maybe you just have a really really orderly society. It's not jarring, just different.

The farmland is good. Some new city designers forget how very much cultivated land it takes to feed thousands of city-dwellers. You're doing well, by implying the farms go on further to the southeast. The forest and shrubs are scattered nicely -what'd you use to generate them?