We have removed "security image" feature from the login page. The reason for this is that the feature wasn't really useful for security purposes, and it also caused confusion and false alarms since it relies on the user having the same IP all the time.
Instead of remembering the security image, you can check that your browser has the lock icon and the address is either https://localbitcoins.com or https://localbitcoins.net.
However the most important security action is to enable 2-factor authentication for your account. In our experience is the most significant improvement for security.
Happy and safe trading!