I started working on interiors in Revit also. I ran into several little things as I worked through my first attempts. Some key points

1. Don't just render a high quality image right away. Takes time and you don't have any idea of your lighting. I start with a quick draft to check lighting.
2. If doing a render with sun and artificial light, you may need to tweak the light out put of interior lights or adjust render exposure. I also found changing the sun angle from 35 deg to 70 deg.
3. Play with your materials, you can adjust settings for all materials, you are not stuck with out of the box materials.

First Try at Rending in Revit

Here are the results of my first tries at Rendering in Revit. I have been busy work in a different areas in Revit, but I have not spent much time on rendering. I found the quality of the images to be pretty good for my first major attempt.
I have noticed a few items. First the Exterior Rendering is easy. Make sure you add some ground below it, looks funny floating in mid air. I did this by creating a separate project for the site. I created a Topo Surface and divided it to create the parking area and grass. I also created a floor for the concrete walks and added some plantings.

This image is a dark, but shows the concept. I added exterior lighting and created a night rendering. I had to adjust my materials on the CAD EXPO sign at the top of the building. I adjusted the materials and adjusted an area for the material called self-Illumination. I would also adjust the exposure settings the next time I render the view. That would allow me to adjust the exposure.

Up Date: I have adjusted the exposure setting and rendered it again.