You must take your MT Driver's license photo at the DMV office. When you take your photo, you should make sure that you wear what you would wear normally. It's extremely important that your face is clearly shown and recognizable. Look straight at the camera and do not smile, as a resting face is easier to identify.
When you apply for your MT Learner's Permit, you will need to bring proof of your identity, your residency in Montana and your lawful presence in the United States. If you are under 18, you will also need a parent or legal guardian's consent.