#1 - I - like really like your design and your inclusion of a variety of pets, and the color link between the dog and "Paw Prints!" I'd like to see you play a little more with the lettering style for "Paw Prints" to convey a little more personality or emphasize the art of the photos business. Also, lightening up the color a bit to have a little lighter feel to it. "Pet Photography" wording gets a little lost - it's so much lighter than the rest of the logo. On the pet images only one suggestion - to add a 3rd color to emphasize the variety of pets.
I like the added shading in the graphic - makes the pets pop more. I also like the paw print above the "i." The only change I would like is to change the shade of green in your newest Entry #16 to the one you originally had. I liked that color much more.
Oh - one more thing... the shadow of the picture is mixing in with the shading you added into the graphic. I'd much prefer keeping with the newest shading only.
Thanks for the quick work - I really like entry #18!! I'm asking for my network to weight in on the top ranked logos, and I'll let you know if there's more feedback.