The Proof is In, Mona Lisa was happy

They used a computer to analyze the face comparing it to a database of young women’t facial expressions and the verdict is:
It concluded that the subject was 83% happy, 9% disgusted, 6% fearful and 2% angry, journal New Scientist was told.

They go on to say that this type of software could lead to computers that know the user’s mood.

Here’s the full article.