If you're not able to see your images, it's most likely that your DNS has not updated. You can see the news post for more info on getting your DNS to update.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .