The shading is very flat, just loading these assets into a BPR engine like Unity or Unreal will dramatically improve the look of the game.

Because everything is the exact same color its hard to see the shape of the objects, you can fix this by adding some lights to tint things.

The theme is good, feels like a holy place.

Good depth, the light from the balcony makes it feel that there is more to see just out of reach.

Good re-use of assets, it isn't clear that they are mostly copies.

The brighter scene is more clear, however you lose the atmosphere. Use the dark scene with small point lights behind bends and such to make them pop out. Using light with a slight yellow tinge will match your theme.

I've always had some issues with transferring assets from Maya to Unity.

Unity has lots of problems importing from any 3D software, you can ask here I have solved most of them and other people on this website uses Unity on a daily bases.

I would recommend Unreal, its the perfect engine for artist.

I like the altar and the general architecture... I agree witblh scouting ninja however that the scene currently looks a little flat.

I think besides the shading some postprocessing effects would also help to make a dark scene like this pop more.

good rays / lightbeams for the windows, some bloom to make the candles stand out more. Maybe give a full volumetric lighting system a try, there is a very good one floating around in the unity forums which a very nice unity user has open sourced and works like a charm in my prototype scene.

One thing I am not sure about is the bright white text on the ground... should this be glowing? Looks like it. Again, a little bloom would make this clearer...

I've always had some issues with transferring assets from Maya to Unity.

Unity has lots of problems importing from any 3D software, you can ask here I have solved most of them and other people on this website uses Unity on a daily bases.

I would recommend Unreal, its the perfect engine for artist.

I would have tended to agree with that statement up to Unity 5.3... since that version, most import woes are gone. Works like a charm for blender and 3D Coat models, haven't tried yet importing a ZBrush model directly, haven't used Maya since a year so cannot comment on that.

But generally, I personally found it easier throwing together a quick scene in Unity. Personal opinion of course, and Unity still has many pitfalls. Still, as long as we don't go into the "Blueprint vs Unity C#" discussion (which will turn into a discussion about personal taste quickly), I can also recommend the newer versions of Unity. Aside from some remaining woes *cough*Lightmap Baking*cough*, Unity has recovered from the 5.0 disaster upgrade quite well.

I would have tended to agree with that statement up to Unity 5.3... since that version, most import woes are gone.

True lots of the problems where fixed but there are still a huge amount of them:

Scale and rotation import problems, a huge pain when doing a lot of models. A lack of collision tools. Doesn't support a back and forth workflow between 3D software and engine; making level design much harder than it needs to be.

Unity doesn't support all animation types, re-targeting animations is a huge pain when compared with Unreal, animation optimizing has a lot of holes. Materials and texture have very limited options unless you use code.Smoothing groups can cause problems with normal maps. Very limited real-time mesh tools. Textures load wrong in webGl when using Chrome or Fox, causing memory leaks.

Last is the limited performance tools and instancing support.

However in Unity's defence, it's better at batching than Unreal, maybe the easiest engine to learn and use. The best engine for single developers, a good market place. Because it doesn't have all these tools it's a light engine with all you need to make a game.

Most of the above problems are only visible in large projects and they do have workarounds or you could use plugins to fix.

There's a picture attached. Let me know what y'all think now!

That looks ten times better, I can even see details I missed the first time.

if you want to push it further you can add some dirt: http://www.3dtotal.com/tutorial/648-to-dirt-or-not-3ds-max-by-oxhido-scene-building-church-alley

As is it's better than most work seen in indie games and if you plan on doing everything yourself you can't get hung up on once scene too long.