" can i wrote under my site that all the pic there are copyrighted if this is not true? i've not registered anywhere...." You're talking about a different thing. Registered Mark, which has to be registered, has nothing to do with copyright. You are the owner of the copyright as soon as you create something. You don't need to register anything. Unless you give the copyright to somebody else or you have signed such a contract with somebody, but that's another matter.

-- erlik