Unusually, thiis isn't one that screams out to me in the way your stuff usually does...
I'm not sure what it is, but each of the components, the saucer, the secondary hull, the nacelles all look impressive on their own, but oddly the sum of those parts isn't gelling... perhaps its because they feel as if they are from slightly separate timelines... the saucer looks lsomewhat more traditional TMP, the sec hull looks post-Excelsior with TNG slit windows, the nacelles from somewhere else again. It's frustrating that I can't quite put my finger on what I'm trying to convey, but hey, so long as you're happy with her, what does it matter what anyone else thinks?