The pic has to be on the internet, that's the catch.
Find the pic on the internet, and then just paste the link to it right on the message. (hint: when you find a pic, right click on it and select "View Image", it'll open the photo in it's own page, and that's the link you paste)
Happy, smile! Sad, frown! Use the corresponding face with the corresponding emotion! - Kate (Meg Ryan), French Kiss