Wow the building looks fine yet. But the onion dome is too much protruding. The proportion looks inbalanced with the building.
The onion should have a defined ogee at the base and the protruding of such a tall tower could not be more than 1/6 of the diameter over the walls each side of the tower and th onion should be more towering.
Or the protruding doesn't stick out of the diameter of the turret, than the onion have a narrow collar around the base.
...puhh a lot of onions in the text - I hope nobody have tears now
Greetings
Frank