The main islands aren't too bad with the changes you have made, however it's still a theme I don't really understand, the block pallete used is just strange. As for the middle, a giant ass mansion (with no detail), just doesn't go. It's like you got a schematic of a mansion you made and just stuck it there, and labelled it as a map. It's just doesn't 'wow' me or make me go "dayummm this map needs to be added!"
Like, what do you think I should change or add to the main island and the midle? :D