A picture of what??

So the terms of the bet proposed by my brother is I have to lose 40lbs by my birthday or set a bathing suit picture of myself as my profile pic on facebook. He was very careful to stipulate exactly what he wanted. Current picture, no far away photos, no cover-ups, no tshirts with bikinis painted on them, etc. That does not interest me in the least so I have to lose 40 lbs by July 4th. I guess one of us will be celebrating! He has to take an equally unflattering photo if he doesn't lose his goal as well.