You can send images freely with other application users through messages. To non-application users, you can send images over MMS in which case your carrier’s charges will apply and you will be switched to system application.
Open Messages Tab , all messages/conversations will appear below
Click on the existing message or create a new one, conversation screen will appear
Click on the Image icon
Open the folder and select the image(s) you would like to send
Click on "Done" to send the image
You can send maximum 5 images in one message. You cannot send image and videos simultaneously.