I love the Alliance Vanity Shield's visuals on most ships, but I despise how they look on the Ambassador-Class. White saucer section with a black secondary hull/pylons/neck/nacelles. Seems to have the same problem with the Platinum Vanity Shield.
The TOS Constitution looks like a candy cane with the Alliance Vanity Shield.
For some reason, I don't have that same problem with the Platinum Vanity Shield on the TOS Constitution.