I love the colors, but I think the Sangheli stuff clashes with the human architecture, I would go for almost an abandoned Dubai type of look. I think it has potential but you really integrated 2 clashing themes. Keep the colors though I love the way the orange looks with the sand, I would recommend some complimenting colors though in addition to some other textures (Maybe some black marble in some areas?). This is YOUR map though so don't take this as an order.

 

Ya I agree that the sangheli stuff doesn't go with the human theme... it might just be me though because I don't like the forunner/human part on Orion II either... it looks like you nailed the layout though!

 

think someone's beaten you to it