#001 - Sign Up
What is, at a minimum, required to sign someone up? Two fields - an email address and a password. The email address can be used for account confirmation, and can allow a user to login if mistakes were made while creating a password. This eliminates the need for a second password field. An option is provided to view the password in clear text to assist the user.
The display picture is not mandatory. However, and especially on mobile devices, users may have a profile picture readily available and the field provides the opportunity to personalise an otherwise sparse sign up form.