since you already finished the 3D models, I'll suggest you spent a little more time to refine the rendering..........that's the biggest benifit of 3D model..take advantage of it.
in order to encourage the original design, I'll add you a point first, but you know on normal circumstance, this is not a acceptable presentation.so when you got time, refine the rendering......let's see what that will make the difference.
Don't try to use rendering in Pro/E. This is not a good idea. ~~xx(
The rendering interface and function in Pro/E are not so friendly.
Just try another software, like Rhino ,3D Max or Cinema 4D........
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why not use wildfire ?
I really recommend rhino , 3d or cinema