Attached Link: http://www.blendernation.com/2006/08/23/yafray-lighting-discussion/

You might want to take a look at this web page - blendernation has lots of good info.

I would add some fill lights (area lights at low intesity) in the room.  

Also on the render tab a couple of extra tabs will appear for yafray, switch on yafray GI on the second tab (slows things down but GI = Global Illumination adds a whole host of useful lighting clculations.

I imagine that your picture had ray mirror enabled and now yafray sees the setting as too high and is reflecting too strongly, go back to the material and try unchecking the ray mirror button or lowering the reflectivity.

If that all sounds like gobbledygook, ask again and I'll try and help more effectively

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.