Is it possible to recolor veneers after applied? If not, what are the next steps to fix them? (photo)

I went through a long process of getting veneers and in my final appt they gave me the impression the color was great and if I whitened my other teeth a smidge, it would be a seamless blend. After having whitened them for 2 weeks, there is no change to my natural teeth and I am unhappy with the veneers in natural lighting. I signed giving consent to apply veneers but I'm now disappointed. Is there a way to change the color without starting over?