Rendering in Revit can be a somewhat fiddly process. André Aksetøy shared some great Revit rendering advice via the autodesk360rendering blog recently.
Here is a sample of it:
"I also like it when the crop region aligns with lines in the scene (fig 6).
When it comes to lighting I always render with both sun and artificial lighting to get some contrast, I try however to avoid direct sunlight through the windows to avoid too much contrast.
I take several test renders to make sure I’m on the right track.
I think the ability to adjust exposure online is a great feature. Usually I enhance the contrast and reduce the colors before I bring the picture into photoshop for post-processing. In fig.9 you see the raw render and in fig.10 the same picture after the adjustments.
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