Jo,
I love this series you are producing, I understand how you turn them, I just have trouble understanding 'how you turn them'.
At first I could not understand why you left the pith in the upright then I realised that if you cut it otherwise you'd have a short grain weakness in the vessel.
And for my thoughts, I like the shape of the finial, maybe it could be slightly longer and more waisted at the narrow part to make it more delicate.
A fine turning.