aside from the jarring fact that the pic is a 1990 heres a more accurate idea of a '94
things to note: they plumped up the rear bumper a tad, those are the factory wheels from '94, rectangular exhaust tips, fender vents/gills have 4 horizontal slits instead of the 2 vertical gills, they made the body molding a bit thicker than the 1990 version.
Another thing worth noting is the concave body work on the lower rear bumper and rocker panels which are distinctly unique to the zr-1. So watch out for that when looking for reference shots
Below is an example of a non zr-1. It has the same wheels, but the styling cues are much more rounded and less aggressive.
Quick little bit about the interior is something I always thought was kind of.. awkward about later model c4's was the asymmetrical seats as you can see here
the bolstering is much thicker on the inward part of the seat than the outer side for whatever reason.
Last thing worth noting is the different door panels in 94-96 vs. every other year
how it looks with the complete interior
If I think of more things specific to the 1994 model I'll be sure to give you guys a heads up. Until then hopefully this helps.