It's looking *really good*, and I love your work flow - the rivers look fabulous. My only comment is that the field texture does not quite work for me because they 'fade out' at the edges rather than have hard edges, often bordered by vegetation (hedeges, trees etc). I often have this problem and the only way I've found to solve it is to use a layer mask and hard edge brush to follow the edges of the fields. Again, it is one of these things which the eye forgives when you are zoomed out but which looks more obvious close up.

The colours you are using are really lovely.