With your skin tone and hair color red or maroon sound like GREAT options! Steer clear of golds, greens, and blacks....personally I have seen them on stage and I think they make the girls looked washed out and yucky with all the lighting. Make sure your make-up is heavy as again, the lights wash you out. I'm not a big make-up girl...but lips and eyes are huge on stage!
As far as your routine goes, for me, there were 4 different ones, as I am sure your posing coach has made you aware of. Front, side, back (the most difficult) and "relaxed"pose. The relaxed pose is far from being that...that's for sure. But focus of squeezing those quads heels together, toes pointed out a bit. Squeeze that "beach ball" in your front and back pose to show your shoulders, delts, traps, and lats. Most importantly, while your concentrating on squeezing, don't forget to BREATH! Yeh right...amongst remembering to smile, boobs out, hips flexed, tummy in, back arched, and looked relaxed. Ha ha
You are amazing and I am certain will be top 3...I just can sense it. You have trained hard, dieted gruelingly, and have stayed focused with all the other things going on in your daily life. As many others have said, you are already a winner in our eyes. No matter where you place, you have come a long way baby! Chin up, keep going...your in the homestretch!
I'm sure you do and will look awesome! Thats great that you will not have to worry about the expense of a suit right now, and teal is a great color. Keep up the hard work! you are doing great! 
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Great read!