Sorry you've had such bad back problems - can quite understand you feeling self-conscious. I'm sure you can find a way of posting a picture that gives a clearer idea of your body shape without feeling that you're 'baring all'. If it's any help, you can always take it down again very quickly, which lots of people on here do anyway, once you've had enough responses - you could choose a time of day to post when lots of people are on (Angie often checks first thing in the morning) and post it under 'Ask Angie' which might help. I think that you need to be straight on to the camera with arms loosely by your sides.
Your first picture was fab!