Veneers: top and bottom don't match, left and right different shapes and sizes, I can see my tongue through front teeth! (Photo)

Your dentist had placed translucent edges on your porcelain to make them look more natural, that is why when you put your tongue under them you see it!
I believe you had instructed your dentist for the color and translucency before hand! If certain areas are sharp, that can be easily be smoothed out, in which is easy fix. see your dentist. Once the veneers are placed in your mouth we can not alter color or translucency any more, unless we cut off the veneers and redo another one!
Best of luck,

Hi:My suggestion is to go back to your dentist and share your concerns.  Most of the times with some minor adjustment most of the concerns can be handled.Best,Dr. Maddahi