I think the opening should have been a little smaller for myself that is the hardest part I have rarely thought that the proportions of the top of my hollow forms look right.
We are always our own worst critics!
Beautiful piece of wood, and I really like the feet and the carving / texturing. If I had one critique on the texture it is that the transition to smooth wood is so abrupt. Maybe have the carving get shallower as it meets the transition and eliminate the hard line?
I actually like the texture on top of the incredible figure of the wood. True, it interrupts seeing some of the figure, but adds another layer of interest that makes me want to look at it more.
The size of the opening looks fine to me and in proportion to the size of the form. If I were to change one thing on the form, I'd increase the slope from the shoulders down and narrow the base just a little bit. However, if you had done that, the feet may have looked out of place. Hard to tell from the pictures.
Really fantastic looking piece and kudos for having the guts to use these techniques on such a great piece of wood. I don't think I could have!