I agree with SeanMartin above.

Also if you got a a small camcorder, or webcam, film someone in the bed turning over and check it as you work on the animation. Is the small details that add realism.

Most animators have a mirror in their desk and check their own expressions when working out lip-synching, etc. They check and film each other and themselves constantly to get the right movements.

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-'I curse the day my curiosity led me to investigate the strange stain inside
the atomic acelerator chamber'-
The Nuked Bug