This area is regarded as a World Heritage International Dark Sky Reserve, one of the first in the world as I understand it... There is an astronomical observatory in the hills above the lake where people go to get amazing shots of the stars, sometimes reflected on the lake surface.
http://www.laketekapo.com/blog/2012/...k-sky-reserve/
I like the photo very much. what you do to it depends on what your intent is: either highlight the church or the starscape. If you want to do both I would suggest actually darkening the whole thing as, to me, the light intensity immediately draws me to the church.