That's a fab picture Del.....better get a couple of inches of duct-tape across that nipple though fellah, or the next time you see it it could be stuck to the target!
Seriously; it's almost impossible to assess what you might be doing wrong from one picture, but from what I understand, I'll bet my metaphorical broadhead that you need to keep more weight in the front leg, stay pushing forwards and lean into the shot more. This will ensure that your shoulders and back are really working, otherwise its all arms and they're nothing like as strong. It's so tempting to take your body backwards with the string thinking this will help the length of your draw, unfortunately you're also taking the bow back with you so this doesn't really add anything to the equation.
Important to remember we're not talking about a rolling loose here
so step forward, turn it out, keep your weight in the front leg, stick your butt out and lean into the shot more. I reckon lack of lean is primarily where your "moob" is coming into play!
Hope to see you on Sunday for the roving shoot with the Finsbury Mark
Happy shootynge!