Hi,
When i go to the admin panel, the counter for each image is still at 0...
I don't understand why, because, i know that some people comes to my galery.

I use the default theme...
Can you help me?

That is because the hitcounter is not implemented by default. You have to add that function to your theme yourself, it is not that hard: http://www.zenphoto.org/documentation/functions/_template-functions.php.html#functionhitcounter