I have a "not for sale" passworded gallery where I upload stuff that I want critiques on or to post here in the forums. If you put a password on the gallery and only click on that gallery when you upload the image, only you will see it when you're logged in, but you can share it. If you want people to take a closer look at it, you can just post the password.
I don't put anything in there I wouldn't want anyone to see, so I share my password freely when I upload something I need help with so people here can look at it closer, but the general public doesn't see it.