Are those the re-done FX for TNG or the original ones? The screenshots would suggest that the Constellation is almost as long as the E-D. The close up of the bridge (in the nose bay picture) looks like it has a tiny bridge was stuck on top of the original dome structure suggesting a ship far larger than being a contemporary of the Connies and Mirandas...
LOL, you know, in all the years I've seen this ship, I've never noticed that the bridge had that extra dome on it until now (and it's there on the original studio model, not added in with CGI). But honestly I don't think it's supposed to be a smaller bridge. It's probably just another doodad they stuck on the model with the other anime kit parts.
As for the screencaps, I view it as more of a "forced perspective." That is, the Stargazer is actually much closer to the camera than the Enterprise is, and the tractor beam is coming from the Enterprise from an angle instead of being on the same plane as the smaller ship.
Or, perhaps the Stargazer was one of those super-sized ships from Star Trek '09?