Visualization is very important in Architecture and the built in Render Entourage and Plants look good enough on a simple rendering but this feature could be greatly improved.
Let us freely import images to create/modify our own entourage without the need for Archvision. Having "2D Face me" like in sketchup would also be a great addition.
Revit families are very powerful and I believe that little improvements like these would be incredibly beneficial.
Regards,
Matias V