Pete,
all the curves in this are just so right, even the blending at the narrowest part of the waist where it turns out, and the flair below that to the first part of the base. The slenderness of the form gives it lift and elegance.
The teardrop shape of the finial is 'right' and the ball below it looks spherical with the widest part of both the same diameter. The only small error is the fillets either side of the cove separating the tear and ball are different diameters.
Sorry I know I'll have done it to you again, and it's only someone like me that will see the difference but it is what I see.