From the Start screen, swipe left to display the Apps list.
Alternatively, tap All apps (located in the lower-right; may require scrolling).
Tap new (located at the bottom).
From the To field, enter a 10-digit mobile number.
Alternately, enter a contact name. As the name is entered, a matching contact may appear and can be selected at any time.
Alternately, tap the plus symbol (located in the upper-right), tap a contact then select the appropriate mobile number (if applicable).
Repeat this step as necessary to add additional recipients.
From the "type a message" field, enter a message.
Tap Attach (located on the left; above the keyboard).
Tap Camera (located at the bottom).
Aim then tap the Camera button (located on the screen near the bottom) to take the picture.
Tap Accept (located in the lower-right).
To discard and capture a new picture, tap Retake (located in the lower-right) then repeat step 9.
Tap Send (located on the right; above the keyboard).