Hey Mantthew, looking good. I can see you are making improvements with your maps. Keep it up.
As for this wip i would reduce the shadow/highlight around the rivers. There are a bit too wide in my opinion. Also pay attention to the strokes. it is important that both shadow and light follow the river. It does not look good if you leave space between shadow and river (like for example two top vertical rivers, you can see lighter tone of parchment between blue river and shadow)