Thinking of @dduane's Dark Mirror again I remember the first time I ran across this Enterprise-D study model I blurted out loud "THAT'S THE DARK MIRROR ENTERPRISE!" and I think it was because of the enlarged secondary hull.
(The Art of Star Trek, 1995)
And while it doesn't necessarily look meaner that's what I've picturing ever since.
The exact quote btw:
It was Enterprise. But not his Enterprise. It was a dark gray, even enlarged, a gunmetal color, cool and unfriendly. The design was overtly the same—the great sloped disk of the primary hull, the nacelles, the secondary hull, all where they should be. But the secondary hull seemed larger, the nacelles were raked farther forward, and lower. The primary hull’s curve was deeper and now had a frowning look about it. If ships had expressions, this one had its eyes narrowed. It was a cruel look, and intimidating. Just visible, because of the rake of the primary hull, were the characters ICC 1701-D ISS ENT— The rest was curved away out of sight.
Come to think of it, it also gives me a bit this Andrew Probert design:
