You should center the vase

Good job btw

Good shadows, good AA, awesome.

This looks great, the only thing bothering me is the jaggyness of the shade color against the main color (this can be fixed by smoothing out the line and lose the "dithering" there). Highlight + AA looks excellent!

I'm diggin' it too.  Great practice!  Trying to guess what the shape of the bottom is like is a bit mind boggling though.  Perhaps because it looks flat and round at the same time.