Yes, you cannot complete registration without one.
Let's be honest, our first impression of someone is usually based on appearance, even if we don't want to admit it. Attractive World caters to that basic instinct.
Don't be intimidated by this. We have such a variety of members with different tastes; looks may be subjective but our community will be diverse enough to meet everyone's preferences.
Just make sure that you're clearly visible on the photo and featured in the best possible light.