Those last few are really cool, but I don't know if they're very Buick. More like Cadillac--boxy, edgy, sharp and wedgy. Buicks are curvacious, flowing lines and clean trim. Crisp, but not sharp. I know the Grand National from the 80's wasn't, but nothing was close to curvy in the 80's except maybe some Fords, and they were radical "jelly beans" at the time.
Then again I'm new. I do like them, regardless. Great work here.