Dont be disheartened Olivier maybe take a look at some of the images you post like Roma the sword and Namur ones these have done well... On average you have had 40 plus views per image up to  120 plus views which is very good...

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt