Didn't you post this same map yesterday?
A lot of people just post multiple threads for the same map..
Back on topic: This map lacks way too much detail. I would start by taking out the pixel art, pixel art is near and all, but its pretty ugly. The sphere is just made with world edit. The ufos need to be improved a lot, they lack a good color pallet and don't look well made. The ones in the center are really poorly made, and the rays they are sending down look really bad. Overall this map needs pretty much everything to be improved, just keep on working on it and I'm sure you can make it even better.