I would think you wouldn't have to draw the animal. You could get pictures and glue it on and finish it somehow.
The sloth is evidently one of my animals, considered a green iguana. Have had many reptiles over the years and 3 have been Green Iguanas. I really have found them to be intuitive and felt the connection went both ways. Especially with my last one, who I had for 17 years.
I loved the deck when I first saw it at the psychic fair and couldn't leave without it. We got home and my girlfriend, who's more into tarot/oracles than I am, suggested I pick my favorite card. I went through the deck and picked the Hawk was the one I just LOVED. Upon going through the deck later, we discovered there were 2 of that card. It also seemed the no matter what I did that Hawk card always ended up in my hand. Now I keep it on the top of the pile. It felt like it was special and had purpose. For months after that I would see red-tailed hawks swooping over the car, and flying around us. Even in the inner city where I'd rarely, if ever, seen them before. Even one came into the back yard!!
I personally fell this deck has some of the most beautiful artwork. And I just love animal decks anyway.