I think this looks nice so far, though I would say that it looks quite cluttered right now due to the amount of structures built.
I know this is meant to be themed around The end - but it looks a little bland to me because of the limited pallet of end stone and purple blocks.
Finally keep in mind that there will be a lot of chests on this map, and it adds more in the air by default. I recommend only placing portal frames where you want chests to be guaranteed to spawn.
Also this might be just me, but it looks much smaller then a normal map
If I’m wrong please correct me
Goodluck with your map! 