Confirming a password is really cumbersome and not helpful. Remove the »confirm password« field in favor of a »show password« checkbox.

For reference, see Jakob Nielsen on the topic http://www.useit.com/alertbox/passwords.html

Instead of a generic »submit«, the button should always be labeled according to action & context.

For example, »Register« when you create an account and »Log in« if you log in.

When submitting an image, it's currently necessary to fill in the title field or the user will get a "Field must be between 1 and 500 characters long." notice.

However, a title should not be required when submitting. For instance, when submitting a large amount of images the user might not want to think of and type in titles for every single one. We should leave it up to the user to determine whether titles are needed or not, instead of blocking the submission process.