Here's a dragon species I made up, as far as I know. These pictures are the dragon when it's old, an adult, and a baby. They have 4 toes, and on the front paw there is an almost thumb-ish finger. The spike on their tail grows with age as does the frill. Scars are a sign of strength and wisdom, so the old guy is really well off. The adult is just out of adolescence and still unexperienced, he has a lot of mistakes to make.