Veneers too white? Will they fade a little? (Photo)

I just got 6 veneers today. I was happy with the shade of the temps, they matched the rest of my teeth perfectly, but the permanent veneers seem way whiter, they make my lower teeth look darker... I do not like the color difference and don't believe I can get the lower ones as white as the upper ones by bleaching them. I also think that the upper teeth look un-naturally white. Will they fade a little bit or should I take my dentist on his offer to redo them if I'm really unhappy with the shade?