Does this look like B1 veneer shade? (photos)

Impossible to say without comparing your present color to B1 shade guide. I advise going back to your dentist and both of you look at a B1 shade guide placed next to your veneers.

Your two front incisors are not the same shade as your other teeth.  
3 things will control the final shade, the veneer, the tooth and the veneer cement.  Nothing is harder cosmetically as trying to make two objects glued to a tooth look just like your natural teeth.....but it usually can come close.  
I am sure your dentist will work to make you happy, make sure to ask to see the veneers on your teeth with the appropriate "Try-In" veneer cement shade before permanently cementing them on.
If they cannot improve your veneers, I would suggest visiting a dentist that makes their own veneers in-office as they will usually be able to custom shade/stain.  CEREC is one of the systems dentists like myself use to make ceramic veneers, crowns and bridges in a single appointment.

Hello, Thanks for your question. It is difficult to assess what the exact color of your veneer is from from a photo without a shade guide. The front 2 appear to have a slight yellow hue however we don't know if this is because of the shade of the veneer itself or the underlying tooth. See your dentist to address any aesthetic issues. Good luck!

Hi:The veneers appear to be yellower than B1, however it might be that the color of your tooth is also influencing the color of the veneer as well.  You might need some opaquer cement to make the color of the veneer a bit whiter.Best,Dr. Maddahi