It suggests I'm confidant, aware of my environment and am not a good target for crime. The way I do this is that I visualize how I want to appear. I think of what I want people to see. I then shape the energy of the shield to fit the suggestion. This step is more intuitive than anything and requires practice and experimentation.
Similar glamours are also effective.
I had a friend who was tired of being hit on in the bar where she was working. She created a glamour that flashed 'back off' when customers started to flirt or take liberties. Attractiveness glamours really do the opposite. Try experimenting and see how you go. Remember not to manipulate people's free will.