First, I want to say that this is a great piece of art! I love the details., the palisades, the tree groves, the flowers/berries in the garden... just great..
A couple of minor negatives.
- Just how darn big are those gates into the mountain! They may well be huge, but first impression is that they are not scalled well...
- Unless you have something else going on such as a spring inside the channel, the river sources you show on the map could not support the volume of water. At the widest point, they look to be as wides as a football (American) field is long or so.
Yea.. these are some minor nits, but in the end, you have produces a masterpiece.