Do my zirconium crowns looks yellow? Chose b1 shade ( photos)

This is a very tough situation.  The porcelain veneers appears to be well made with a very natural appearance.  The margins fade beautifully into the tissues with no apparent inflammation.
What makes this difficult is how the shade was chosen.  What shade were your temporaries? When did you chose the shade? Why is someone posting bleaching shade videos on You Tube that mislead and confuse patients?  Obviously, the individual posting these bleaching shade videos online is completely out of their element.
Regardless, the crowns look very nice and natural.  That being said, what was white 10 years ago isn't white in 2019.  Finishing veneer/crown cases in bleaching shades appears to be the norm and not the "extreme".  With the help of proper labs, natural characteristics can be built into bleaching shades for a realistic finish.