That's not a problem. Every photo has its own privacy settings. You can make a photo available to everyone (that's public, and includes people visiting the site who aren't Flickr members); make it visible only to your friends, your family, or both your friends and family; or keep it completely private.
Bear in mind that you can always see every image in your own photostream.
You can set a default privacy setting for every photo you upload here.
As of April 20, 2007, changing the privacy level of any photo ("public" --> "friends", or "friends" --> "family") will change the image file name. This ensures that any photo truly becomes private.
Please note that this will "break" any photo that has been blogged elsewhere as the image file will nave a new URL.
Most of the time, yes -- any Flickr member can leave a comment unless you say you don't want them to. We recommend that any Flickr user be able to comment on your photos... but you don't have to go that way if you don't want to.
In your account area you can specify default settings for what you'd like most of the time. You can change the setting for individual photos.
Please note, adding an image to a group will override your comment preferences and allow people in the group to add notes and comments.
All sorts of places!
One page shows you all the photos uploaded to Flickr:
http://www.flickr.com/photos/
Your photo will also show up for your contacts, in a special list that shows them all photos uploaded by their contacts:
http://www.flickr.com/photos/friends/
Photos on this page will also be governed by your relationships to your contacts and how you set privacy on a photo. For example, you upload a photo and set it to be visible to your family. Your contacts who you marked as family can see that photo. Other Flickr members can't.
Your public photos will show up in tag pages, too. And if one of your photos is really interesting, it might show up on the Explore page!
Yes. The privacy setting you associate with a photo is completely flexible. You can show or hide any photo anytime you like.
Note: Changing something from public to private will remove favourites that have accumulated. This is because a favourite is like a bookmark, and if you change the privacy so someone no longer has access, they shouldn't be able to view it any longer.