I had a lot of enjoyment doing this, what I found was that a large amount of emotion was focused in the eyebrows. I would often change the position and shape of eyebrows and find that the face I just made turned into a completely different emotion. That's not to say that other facial features are not important as they are. The jaw and the eyelids are crucial to emotion and so are the lips. Below I go through what process I used to create the emotion on the face and often what I changed from the previous face.

Angry - inner side of the eyebrows are lowered., upper lip is raised on both sides.

Deceptive - Outer eyebrow is raised, jaw is lowered and outer lips are brought up to present a smile. 

Disgusted - Fairly similar to deceptive, except the jaw is brought up and the outer lips down.

Happy - eyebrows lifted and outer lips brought up. Jaw is brought down a bit.

Moody - I brought all of both eyebrows down for this, I also lowered the jawline and flattened the lips.

Sad - I raised the inner eyebrows and moved the pupils to look down, i also moved the eyelids down. 

Shocked - I dropped the jaw, raised the eyebrows and centered the pupils. I also lifted the upper eyelids to give that wide stare. 

Surprised - Pretty much identical to shocked, a small adjustment to the outer lips to bring them up into a smile turned the emotion to surprised.