Unless your woman has specifically asked for a picture, you will do FAR FAR better to get the effect you are seeking by sending an erotic text message.
A text message describing some sexual act you are imagining doing to her, or slightly "threatening" her with what you intend to do later in the evening when you have returned to her.
Be bold, be direct, be dark, do not be afraid to be "innapropriate", do not be afraid to text some things even maybe you would be hesitant to say in real life.
Text her something extremely dirty and over the top when you know she will be in the company of her woman friends, or her coworkers, or other company that would be sure to make her blush if they only knew what she was just reading. Look for these kind of "inappropriate" opportunities!
Experiment with many approaches to this dirty talk, and pay attention to how your woman responds. She will let you know what methods are most effective.
Pictures and videos, for a woman, they are not going to be as effective as they are so much to a man.
A woman, sexual stimulation is not so much visual, as tactile, and this starts with conceptual, and is why texts are more effective than pictures.
Give her these feelings that she is desired with reckless abandon, that there is a man out there (you of course) that is bordering on losing control and intent to do unmentionable sexual things to her, and this man is on his way to her.
Get the wheels of your woman's mind turning in this manner of direction, and you will be pleased with the results.