Should I expect increased traffic if I optimize my images?

How does Image Search traffic compare to Web Search traffic? On a busy site with badly named images, should I expect an increase in traffic if I give all images descriptive names?

Paisa - De Dana Dan (song trailer)

Song Trailer from the upcoming movie "De Dana Dan", starring Akshay Kumar and Katrina Kaif

3 Idiots - Official Trailer

The official trailer of the most awaited movie - 3 Idiots

HD Quality Video

Starring: Aamir Khan, Kareena Kapoor, Sharman Joshi, R. Madhavan and Boman Irani

Produced by: Vidhu Vinod Chopra

Directed by: Raju Hirani

Releasing on: 25th December, 2009