We user a service called Gravatar. Gravatar stands for Globally Recognised Avatar, and is used by some of the most popular websites on the internet. Basically it allows you to associate an avatar with your email address. Then any service where you use that email address can use that avatar.
To start, simply create a free account at http://en.gravatar.com/ and upload your avatar image. As long as you have used the same email address as you registered with BeeFound, your avatar will automatically appear in your profile.