Are crowns/veneers supposed to have any ridges or be perfectly smooth?

Long story short. My first set of veneers and Crowns asymmetrical when viewed at a close proximity appeared to have vertical ridges/undulating appearance. They were sent back. I recently received a photo of my second set. The crowns, front four, have not changed and continue to have vertical ridges/undulating appearance especially when viewed closeup in the photo. Remainder of veneers appear to be symmetrical.