i'd say, never judge someone's water retension by a picture. especially a pic not done by a professional.
cameras tend to wash away a lot of defention.
and how do you guys tell the difference between water and fat in a fuzzy picture like that?
IMO, you don't need a diuretc. they can be dangerous if you don't know what you're doing and you can really play with your sodium and water intake before the shoot.
read up about sodium loading and depleating and how to utilize water intake to your advantage.
but really, keep dieting and if you feel that you need to loose the water after that, do it naturally. IMO, you don't need a diuretic.
check this video out.
Bodybuilding.com - Inside The Life Of A Natural Pro - Layne Norton: Inside The Life Of A Natural Pro, Episode 6 - Contest Preparation.