Do you really think the girl in the picture has anything, anything, at all to do with the quote next to her?
Delivering an effective message is more than simply finding a photo you like, pairing it with the best customer testimonial you have on file, and publishing an advertisement. Every time you put something out into the public it tells a little piece of your story. Consider how those pieces add up. Take the time to ask some questions and to think as your audience would when they see your message.
To whom is it speaking? What does it say? What does it mean?
Is it offensive? Is it insightful? Is if funny? Is it supposed to be?
What is its goal? How does it accomplish that goal? Why is it trying?
Marketing is (no surprise) all image. The best images are refined. How refined is your message?