You must take your TN Driver's license photo at the DOS 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 TN Driver's License, you need to submit two documents that prove your identity, two documents that prove your residency in Tennessee and your Social Security Number. If you are under 18, you need also bring proof of your school attendance.
If you are under 18, your parent or legal guardian should accompany you as they will need to sign a minor/teenage affidavit and assume financial responsibility by signing a financial responsibility form.