Hi Robert,
 
Your dog cards are adorable, though they do look too dark on my screen which is calibrated to RGB.  As a general rule of thumb, I have found that cards from GCU print exactly as seen on my screen.
 
If I were you I would lighten your mid-tones on all of them, they don't appear to have the 'punch' that they should...and they are so wonderful, they should really pop off the screen.
 
I speak as a trained photographer, perhaps others can give you better advice.

Robert-
Jason here, from the printer. With my calibrated monitor, I am seeing some of the cards of the dogs (I'm not sure which one, but I just went to your last page) as pretty dark. If you give me your order number (that's the long, multi-decimal number on the back of the card under the barcode) and the date you placed the order, I can pull the actual card and reprint here to take a look.
As well, you can forward me the images if you wish and I can take a look at the original.
jasont@ampprinting.com
We'll find a way to get them looking how you want.
 
Best, Jason