One of the most important things that an animator needs to get right is to learn how to create great poses. Part of this is learning how to create a great silhouette, one that reads clearly.
The image on the left is taken from Eric Goldberg's book "Character Animation Crash Course", a copy of which we have in the library, one of the best books on character animation.
Eric shows how a single pose can get an instant "read" from the audience. Even though the images are shown blacked out in silhouette, we still know exactly what the character is thinking and doing.
Always make sure your poses, whether drawn or digital, communicate exactly what the character is thinking, feeling and doing.