I like the idea of a church floating on an island at sunset, but there still could be made a lot of improvements.
Try for example to use more textures for the textures, as it currently looks more like a tomb due the concrete bricks.
For the lighting; visit an ordinary church. You'll notice the inside of the church often is brighten by the sunlight which shines through big glass windows. Perhaps you should try to implement that to make the inside of the church more interesting.
You can also keep a side of the church open and make it broken. This creates a gab for the lighting and makes the map feel more natural.
You did quite a good job in forming the island (I guess you've used the heightmapping feature for that?). However; try to minimize the bumps on the field, as it's not a great feeling when running through the map.

Nice attempt so far!

I made a floating island with a kind of church in it, two years ago, i still have the map and sometimes i edit it, its a nice idea, but its a hard thing to do, even to me, i just figured out some months ago how to make the terrain i wanted. First you need to learn how to make terrains, and then some of gothic, or anykind of architecture, if you dont know how to make those thing i mentioned you cant think to make a hard idea like that, to learn some buildings thing i recommend you to watch at the maps "cphills" and "vovitchurch", those maps are in quadropolis and you can download them directly, and the terrain, just look at "shipwreck" terrains and "tempest" (release maps) looking at it in editmode pressing 7 (outline) making and unmaking some parts of the architecture or terrain can be a very good exercise to learn something new.
greetings

Pretty cool map. The church on a floating island has been done before but I like this one in all it's noobiness. I agree that you should learn how to make terrain without using heightmaps, as it will look much smoother and more natural, and will also provide more possibilities. And maybe either clip the ground or flatten it out a bit, as it does kinda suppress the flow a bit, but then again it is an artistic map so maybe it doesn't matter that much.
The church itself can use more details and textures, I could tell that even by just looking at the screenshot. It looks like just a random gray mass on top of some grass. Spend some time on the little things, it really pays off in the end. I also agree that it might be cool with one corner or something of the church in ruins, to let some light in. But you could also use some spotlights to mimic light shining through your windows.
Sorry if I am repeating anything in past comments. Nice start overall, I like it ;)