Looks pretty interesting. I like the way the stairs look. For a first map, this is pretty good. It would be cool though if you tried experimenting with piece usage. Try expanding what you use and you'd be surprised with how manipulating certain blocks can make your map look that much better. I could already think of a few items that could make those stairs "pop" out more. I myself though am not really big on making core maps so you're better off throwing this into one of the testing lobbies so they can help you with more gameplay mechanics of your map. Good luck and happy forging!

 

You'll want to give a little more color variety to certain parts of your map. Try making some areas darker or lighter or shinier or something. Add a little more color here an there. Your pathways need a little more too. Add extra cover or routes besides the downward stairs so that people have more vertical playspace.

There's a lot you could do with the main structure to decorate it. You could look at real world buildings and concept art for inspiration. I would focus on vertical support structures along the edges of it. Decorate the interior however you like. A distant invisible spotlight can shine down (or up) on the inside and light it up pretty well. Don't worry, styling maps comes with time and experience. Can't wait to see how this one evolves!

 

classic tidal colour burn

 

something is screaming 'New Alexandria' in my ear, but I can't quite figure out what it is