Just my evaluation on the photo;

1. Hair line - Possibly the most awkward part of the pic. Doesn't exactly frame the face similar to the way Risako's does. Also, Risako's hair goes to the bottom of her ear. SugayaImpersonator's ends a bit too short.
2. No bangs. Just a speculation.
3. SugayaImpersonator's eyebrows are also too short, and not proportioned in the right areas.
4. Risako's hair in pigtails normally doesn't have this appearance. It is usually a bit more rough on the ends. Another speculation.
5. RisakoInspector made me notice this one. Risako used to model(I'm not sure if she still does). Usually, models are wanted to have broader shoulders, clothes look better on them. By looking over Risako pictures, I've concluded that her shoulders are not narrow.
6. Haha. I couldn't help it. RisakoImpersonator thinks Risako is married.

Risako doesn't seem to wear rings often.
Last but not least, the strange camera angle. Close up, and what appears to be from the ground. Who leans in to kiss someone when someone has a camera pointed up at them from their feet?
Long post because I don't want to spread it out among many posts...