No, you shouldn't have to print out pictures for a groomer! Have you tried to find a grommer in your area that specializes in large breeds/double coated breeds? I don't know how rare that is but it is worth a shot. Also you could ask some fellow dog owners for recommendation s.
There is no excuse for a dog to be sent home dripping wet! I used to work for a dog boarding/daycare/grooming facility, and our groomers were great! They would hand dry untill the dog was 90% dry and then cage dry. I never saw a dog go home damp, let alone dripping.
Maybe the vet you took Rota to (the one who specializes in large breeds) has a recommendation for a groomer.