I would say that's "drop dead gorgeous" - both the wood and the way you oriented the wood for the bowl. Looking forward to seeing pics of the other piece you mentioned.
I'm about to finish-out a root ball walnut that was harvested close to the OK border - the guy I was with had a slight sensitivity to walnut - with the root-ball, that sensitivity was magnitudes greater.
My experience is the volatility of the shrinkage/warpage is much greater with root-ball - crazy grain areas that were convex when rough turned become concave. The trick is rough turning to a thickness that accommodates movement and, at the same time, not so thick to avoid cracking - while I know the three-hour boil will not change the warpage, hopefully if will contain the cracking.