When you get to the Taj there will be dozens of locals who will offer you their "guide" services. Choose someone who is a little put together and bargain with him. I don't remember how much I paid but it was not much. The guide will likely bring his "friend" at some point to try and sell you photography services and they will print the pictures within 30 minutes. You can also just ask your guide to take your picture if you have a camera.