take a photo of me = you use the camera to take of photo with me in the photo in it take a photo of mine = you use your hand to take away a photo that I have e.g. How, where is my new photo?? Bob, have you taken / stolen a photo of mine? The same for 'of ours' / 'of us', So, if you;re talking about using a camera - 'a photo of us / me / them'