This tutorial goes over 3 different ways to construct beautiful tails for your mermaids and fantasy sea life. It focuses on working from very basic shapes to greater detail.
This tutorial goes over a method of constructing hands from basic shapes. In this exercise you will learn to draw a hand in 5 different positions, though the method can be applied to a hand in ANY position.
Claws can be short and nail-like, such as the nails that you would see on a dog. Claws can also be retractable, such as you would see on a cat. They can be long, like on a bird of prey, or hoof-like. Find a type of claw that goes with your creature.