it would be nice if you wore a black skinsuit against the white wall so we could properly see the contours of your back. your back looks fairly horizontal and you look comfy on the bike. When you race make sure you are looking straight ahead dont look at the ground...
You have a big ball of fingers resting at the end of your bars. For me personally I think you should have your fingers underneath the bars and your wrist cocked forward so there is a smooth flow of air over your wrist. I think your bars should be the same width as your arm pads atm you look a bit like chicken with your arms facing inwards. Have a look at teh australian team pursuit team, brad wiggins, dave millar...there arms are parallel to each other.
besides the arm thing you look good. Some people just dont look as aero as others no matter what bike they ride the fact you ride a 51cm frame means you will always look more like a ball than an arrow when riding a tt. The trek is fine for tt's...I will have it if you dont want it