Not much to add, other than what I've already said so many times about it's beauty.
The one little thing (two, actually) I might recommend is the illumination light source, like of the underside registry. We first saw this stylistic effect in TMP with the refit Connie, and long before the advent of advanced CG tech, the illumination effect was handled, IIRC, by a jig of dental mirrors placed at strategic locations around the filming miniature, bouncing spotlights onto its surface. The model itself had visible light sources, albeit too dim to cast an effective light onto the hull, that would give visual queues as to where the light was coming from. I love the illumination effects that you have put on these models, but they seem to be lacking these light sources to make the illusion complete, such as at the front of the lower navigational dome in this particular context, while still having the bright "hot spot" implying that there is a visible light source somewhere. The second small suggestion would be to place light sources either on the engine pylons or on the front/underside of the nacelles themselves (just like the TMP model) to cast a light beam down on the pennants on either side of the 2H.
Other than that one little thing, perfection achieved! Never thought I'd say that about anything that derived its look from an Ambassador, but yeah - this thing rocks!