nice ....but your measurement not correct. see the main gate and compare with a human anatomy height or stairs size. its not looks correct. always use measurement 3d inch-tape or use any 3d human height reference. ...in architecture modeling always be aware with measurement. i hope u like my suggestion.
But some things-
Mostly Buildings with round top are designed by mughals,or for mashjids!!!
There are rarely churches with that kind of top!!!
& you missed the basic thing,Where is the cross?
work on proportions!!
All the best!!