I really like the structure and layout of this city. I think that the basic color palette is also good. But I am not digging the river texture. You may want to use a blur tool to show the flow of the water. Either put a lighter layer if the river is shallow, or a darker one if it is a deep river, on top of the river and then blur it in the natural direction the water is flowing. If it is a slow deep river then make this less dramatic and lower the opacity a bit.

Also, consider using a single color for all the roads and negative space surrounding city blocks.

I also like the felt-like texture of the whole map. Good job.