Roman Diaz really knows how animals should look. He should, being a veterinarian. A very underrated creator I think. His animal models have character, proper proportion, and are not overly complicated.
Some people complain that the model at the end od the video doesn't look like the thumbnail. You just have to follow the last instruction - shape it as you like.
I didn't have 30 x 30 cm, but I did have 25 x 25 cm, so am trying with that. I had started it and nearly finished with a map from the San Diego Zoo, but that paper was too thick, hence I re-started with 25 x 25 cm kami paper. I am folding three of the same model simultaneously - it helps me get practice on each fold. Although people are ribbing you for the completed model not looking like the photo at the beginning, I think it'll be fine. It helps having multiple models going at the same time, because if I get to the end and one looks spot on and the other two not, I can toss the other two and not tell anyone. :)