If you are chatting with someone and would like to send a picture, consider blurring certain identifiable features to mask who you are. It can still be a nice and fun way to share pictures with people, without fully showing yourself. Remember, blurring doesn't always work because some software can reverse the blur feature. Try using a picture that represents you in a different way such as one related to your hobbies or personality.
For more information on how to blur your pictures on Android phones, check the following link: https://guardianproject.info/apps/obscuracam