From his perspective...you have a 15 day account with almost nothing on it. He doesn't know if you really are male or female and making up stories or not. Are pictures and other information needed in order to form a friendship? No. But they do help. At least one or something else to prove who you say you are. Just so you can put a face to the person you're talking to and can imagine their expressions during conversation. Its hard to form a strong bond with uncertainty.

You can make a short term friend online without seeing each other, but nearly every long term friendship usually involves knowing what the other person looks like. Just giving you and others a heads up if you're looking for a long term friend.