I had this same issue a while back. I ended up rendering to EXR and doing it in pieces and pasting it all together in Photoshop.

Is any of the lighting perhaps Emmissive materials?

I think this is a great start for a rendering. To make it more realistic you need to increase the details. For example, the house, model it like it would be built, so if its brick there will be more than likely a sill under the windows, perhaps some flashing on the top of the terrace wall. The roof wouldn't connect to the walls like that. Take a look at some details online for brick houses and you'll start seeing all the little extras. Secondly the materials, the water looks pretty good and the flowers aren't bad either, but the grass looks unnatural, your glass needs transparency and reflections etc.

Hope this helps,

Rob

Or a bad case of termites

So from what I believe I see, its not the reflection that is the issue. It looks as if something is going on with your background. Could you post a copy of the background-hd-20.jpg? I'm just curious as to what is was supposed to look like.

Rob

Is the OP talking about IOR or the actual reflection value?

Kako6502 just to let you know nobody here will help you if you use a cracked version of any software. Let alone admit it outright. Buy the software, if you still have problems then come back.

Rob

You can also locate the .SKM file and rename it to .ZIP and extract it.

Rob

But to be honest, I've never had an issue with VRAY and overlapping faces (as long as they are grouped). Here is an example I did of a floor assembly. Everything is components and right up against each other. No artifacts.

Rob

Also you can model as you normally would and then use ThomThom's CleanUp plugin to get rid of overlapping faces, orphaned lines etc.

So there is a trick to this.

A) Create a Diffused layer, place a copy of your bump map in it, set the transparency to TexAColor (make it white)
B) Create another Diffused layer, make this all of your gold settings w/ bump, spec etc.

C) Sketchup will see the first diffused layer (will show up as your bump map). So you can scale it as needed, but when you render it will show up as gold.

Rob

Have you tried some the High Quality Interior render Presets?

My guess would be that the faces are reversed.

This is a known error in earlier versions of Vray. Which version are you running?

I personally haven't seen any setting. But you can save it to either an .EXR or .HDR file format which would be 32bit and then convert it.

What version of Vray are you using? I know in the past there was issues similar to this.

I was thinking perhaps turbidity settings in Environment.

It also seems relatively dark, perhaps adding some more light might help. Also having ambient occlusion on effectively adds shadows to all the corners, since the shadows are soft you are going to lose any sharpness you have to edges. You could export a hidden line image from SU and overlay it in post to help define edges a little more.

Notice how all your walls are Purple? This typically means that the reverse face is showing. Rendering software generally doesn't do well with the back of faces. Set your face style to monochrome and reverse all faces that are purple so that only white faces are shown to the camera, then apply your materials to that face only.

Rob

http://help.chaosgroup.com/vray/help/sketchup/150PB/examples_material.htm#reflection_color

Chaos Group has a whole help file for Vray for SU. Really well written.