The picture shows a man and his flaccid dick like you can see very often if you look around in locker rooms, showers and sauna's. It says nothing about his size erect. According to my experiences I would say that it grows just to a very average size.
A picture like this one among all the big sized hard or semi hard dick pictures is rare, but that doesn't mean that his size is rare!
Mikex25 if this is a picture of you own dick, don't feel insecure. If you had to line up with other man you would see that your dicksize is average.
Nice dick and foreskin btw.