How to reduce noticeable lip/mouth protrusion in photos?

I know this is a weird question, but this is for those with any type of photography experience or modeling. There is an event coming up where I will have plenty of photos taken of me. I have a noticeable condition called bimaxillary protrusion: http://i45.tinypic.com/m2cjq.jpg and http://ars.els-cdn.com/content/image/1-s2.0-S0889540697700428-gr1.jpg are examples.

Basically, my lips stick out and chin is shaped funny/more rounded. I have to get extensive orthodontic treatment to fix it, which I won’t have the money for until after I graduate (so another year and a half). I was wondered if anyone knew the best angles for me to stand in to minimize this “protrusion”. If any lighting advice can be given too that would be appreciated. I feel like on my own, I hate probably 15 out of 16 pictures I take, so I just wanted a little bit of pose coaching. Just like which way to tilt my head and body, etc. One of the main issues I have in my pictures is that my mouth either looks too strained, or the shadows that hit the area above my upper lip are too strong/look weird because of how my mouth pushes out :( And taking pictures from the side are obviously a no no, so I know to avoid that