To text pictures on an Android device, you will need to have a messaging app installed. If you don't already have one, there are many free options available in the Google Play Store. Once you have your messaging app chosen and installed, simply open the conversation thread with the person you want to send a picture to. Then tap the paper clip icon or add photo icon (which looks like a camera) at the top of the screen in order to select an image from your photo gallery or take a new picture. You can then customize and send it as an attachment.