no.
by default if not actually copywritten the intellectual copyright is to whoever physically took the photo regardless who is in it. it's like the obama 'obey' poster creator being sued because he used an AP photograph to generate his obamaposter. you can't take credit for modifying someone else's work.
but technically any photo taken and put publicly on the internet other than your own site are considered public domain unless physically copywritten and cited before posting, as in you did the paperwork (only time this doesnt matter is if it's on a private location like a pay site, personal ftp or wahtever then it is considered private and can not be used). so if you put a photo of yourself on a social networking site or somewhere 'public' it's public domain regardless if someone says 'yo i gots copyright.'
Your information about public domain isn't accurate. The US Government Copyright Office says: "Under the copyright law, the creator of the original expression in a work is its author. The author is also the owner of copyright unless there is a written agreement by which the author assigns the copyright to another person or entity, such as a publisher."
So... publication or posting of a work does not affect its copyright at all unless the author (who holds copyright by default) overtly states that he's putting it in the public domain or transferring ownership to another party.