There's a contact us button on the website where you can send them a note - they will ask (either it's in the original contact us stuff or else they will send you an e-mail) for the park, when the photo was taken, what the person is wearing, etc). They can add Tink into the photos where she is missing.
We had 2 photos where my DD was supposed to be holding Simba and instead - Tink was there! They fixed it for me.
You are correct, you cannot add those magic shot things yourself on the website.