I ran into that problem as well...even after uploading 10 photos...all good quality, straight on shots. Just before giving up on it, I had an idea. I changed my hair slightly, took a picture of myself...and it worked.. You see, I normally let my bangs fall over one eye, so I guess that confused the system, since it couldn't find any one-eyed celebrities...lol.
Actually, there's no need to upload the same photo more than once. If at first it tells you that no faces were detected, it means your photo is not suitable for face recognition and you should best upload other photos, instead of trying to upload the same photo again and again. For best results, upload photos were the face or faces are large, frontal and straight. Face recognition doesn't work well on faces that feature a strong pose, angle or expression, or are small or not in focus. So mug shots work best
Please try with some other photos and let us know if you are still unsuccessful.