Emotions: OvErJoYeD~~~~~!!!!!!!

Picture #1 An overjoyed boy!
One glance at this boy on the left, and you can tell he is happy. Actually, more than happy - I'd say he's overjoyed! He is looking up so not all the features are clear. However, even in this angle, you can see his eyes are slightly closed and are arched up like this: ^ ^ just like his eyebrows. Even by this, you can tell he is happy. But this boy is overjoyed. You can tell by his mouth. His mouth is wide open as if he is surprised or is about to scream. However, the corners of his mouth are tweaked up and all his teeth are showing. Also, his hand is made into a fist and are held up, this is an action many people do when something good happened or when they get a question of their homework right. They pull down their fist from up to down whispering "Yesssssss!"




Source: http://wwwdelivery.superstock.com/WI/223/1439/PreviewComp/SuperStock_1439R-681023.jpg


Picture #2: overjoyed man
Judging by his uniform and the background, he is a soccer(/whatever sport) player and he just scored a goal!Whoop! I can see that this man is overjoyed as his face and gestures clearly express this. Just like the boy, his face is looking up at the sky and his eyes are closed. His eyes and brows are arched up and his mouth is wide open. The corners are tweaked up the slightest bit, expressing his happiness. But unlike the boy, he is kneeling down with his arms out to his sides. This position imposes his extreme happiness.


Source: http://cache4.asset-cache.net/xc/78322613.jpg?v=1&c=IWSAsset&k=2&d=9E7D312EDC8D63D0E64E43C7E4EDA2E985FF8531B985B75D6E69CD255C90998BE30A760B0D811297

Picture #3: Overjoyed Woman
Yes, yes, another picture of a overjoyed person. The facial expression of an overjoyed person is clearly expressed in this photo but the gesture is also different. So I guess the point here is that the facial expressions and gestures have a limit to the similarity.
On the other pictures, the eyes are slightly 'arched', therefore, even if I covered up the mouth, you could see there happiness. However, if I cover up the mouth, it is not clear whether this person is actually happy. Yes, the important point here is her mouth. The mouth that is wide open with the corners tweaked up.

source: http://us.cdn3.123rf.com/168nwm/cybernesco/cybernesco0903/cybernesco090300002.jpg