OK from my experience what gives image dose of reality is light!. Till now(proe 200i2 to WF2) there was problem configuring lights (well u must spend about 1 or 2 hours to get nice lights, of in first time more then 2 hours). Now WF3 have easy est way to configure lights.
Second is floor or should I say environment of rendering object. If u render object in blank image (background set to withe) is not the same like when you render in front of some image, or scene.
I don't know of WF3 how is there configured floors, walls (room in general) but I know from my experience that I lose about 1 or 2 hours to get nice room (if I'm Lucky).
Everything else, textures, bump-mapping, map, materials are easy to learn how to configure to get real nice render images.
Concluding tips (or better files) for lights, and room are the ones that we are looking for.
PS: soon I will finish my new project for collage so I will need this tips for real nice rendering images, and then I will this images post here