I really like it. There is good protection for commanders against lancers (the non-lancer player will take the left every time), and there are plenty of safe places for set-up. However, as the map is currently, gameplay will be limited by a very tight chokepoint (the single door in the middle), which means that most games on the map will tend to flow the same way.
In order to both create more advancement options, and also to prevent it from being a very defensive, come-and-get-me map, I would suggest creating some extra doors (possibly as shown) to provide some other methods of advancement and attack. I recognize that symmetry is one of the design features of the map, but it could be good to make a couple of minor adjustments to the symmetry, for the sake of gameplay. My suggestions for additional door placement are in blue, and my suggestions for additional walls are in red. At the top, the purpose of the additional wall on the right is to maintain a good commander-protection spot for the player on that side. The wall-and-door to the left of that prevents a long LOS through that room, and it also works well with the artwork on the floor. At the bottom, the additional wall/pillar is to prevent a long LOS through that room from the safety of the room on the right.
The art on this map is simply beautiful. I love the setting, and I think the layout is good too (with some very minor adjustments). If it were readily available I'd want to see it considered for the Restricted Maplist (I think it's
certainly good enough for at least the Standard list with the suggestions I made). Good job!