Hi,
Being original is a must here. Since there is a successful original app out there, its users are not likely to switch to an unknown social photo sharing app, unless it offers something very special that Instagram lacks.
The features you have stated are not possible to be completed with in 14 days. No matter what killer-feature you settle on, double-check whether no one did it before you. We can recommend JAVA to make it for you. But we at least need 45 working days for an MVP.
Please respond only if you agree with me.
Regards,
Mit-