haven't you seen trinny and susanah when they do naked photos shoots its all about the lighting with strategically placed sheets and the like
it doesn't matter what size you are.
if it's mainly for you I'd just have some fun get some funky looking flowers in vibrant colours and just mess about with them, the odd close up of a flower for your shop wall. Maybe you should go out in the countryside or someit with a few flowers and have play he seems to be really good at landscape type shots with people in them.
Ooh does he know anyone that does make-up too you could get some funky professional make-up done and crazy flower hair piece things or fascinators with close ups of you. Did you see any of the moyses stevens hair stuff amazing floral headreses thats cover your whole head