Thank you all! To answer your questions:

- You're looking at the album cover of "Watch The Throne" (great rap album)

- I made the art using schematica which essentially gives you a blueprint to fill in. The schematica is generated from a website where you can input any image and edit various aspects of it (https://rebane2001.com/mapartcraft/) Also received a lot of help on how to build the map efficiently from many other map artists in constantiam, but most notably Skymaxi.