Do upper veneers cause the shape of your face to change? (photos)

Porcelain veneers can change the shape of the face, to plum up the lips!
From your photos it looks like you only did the upper veneers, in which it plumed up your upper lip line, but your lower lip stayed the same. This can be a bit asymmetrical. We will be needing more photos, the bite analysis, to look into it further and to see the exact reason. See your cosmetic dentist and see what can he do for you.
Best of luck

Any treatment that changes where the front surface of your teeth end has the potential to change your face shape.
Most people say it makes an improvement, but the stretching can leaves concavities elsewhere. Speak to your dentist and ask him to mock up the lower teeth as well to see of this has the potential to balance out your smile and cheeks. 
Kind regards
Thomas Dey, BDS, MSc

discuss your concern with your cosmetic dentist. one more thing i noticed is broad upper arch and narrow lower charge. that is also one of the reason in facial change.  

Hi:Definitely porcelain veneers can alter the shape of the face. It is difficult to tell you exactly why your face has thinned out since I can not see the relationship between the upper and lower teeth in the photos clearly.  It's best to return to your dentist and voice your concern.Best,Dr. Maddahi