It's kind of hard to tell what you need to change, since your art is so stylistic. Here's some things I noticed with the two pieces:
1: the body is too tall, the teeth look really weird since they have a beak, medium tail shouldn't be longer than the body, the hind legs are too tall, the elbows are too low
2: the paws and the claw all look really weird. the paws are too long, and the claw's "thumb" is too big. I have no clue what's up with his neck. The elbow on his claw is in a weird place. The hind legs are too tall, and the bottom part of the hind legs are positioned in a really strange way.