You must take your UT 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 UT Learner's Permit, you will need to bring proof of your identity, proof of your lawful presence in the United States, proof of your residency and your Social Security Number. You can find more information what documents are acceptable by visiting this website: http://publicsafety.utah.gov/dld/documents/DL335Brochure9-13_000.pdf