How many pics we have to add in a particular club for getting 'super' medal?!

You're getting it wrong. It's not about just adding a whole lot of pictures, it's about contributing in general. Granted, if you get plenty of fans for your articles, pictures and videos, then eventually you will, but a super medal is the hardest to get. It's hard enough just to get a Fanatic medal.

You just have to contribute something and have people vote on it and stuff.
Not sure about the numbers. No one really do.