Some of my friends love to wear highly elegant dress in prom and make themselves ridiculous. There is no problem wearing elegant dress but all i want to say that we need to wear such a dress that would suit to our overall personality.
Hmm. At my prom (2012 so not that long ago) more girls opted for the shorter dresses, so you're not alone with wanting to wear a dress like that! Prom is all about having fun & dancing and partying with your HS friends. Why would you do that in a stuffy big dress that'll probably cost a fortune??? All that being said, maybe you should go bigger on the hair (obviously the pic you posted is not the final look, like hair & makeup and all) BUT omg if you got yourself a professional blowout and some tall, hot shoes - you'll def steal the show!!
Not what I envision when you say "prom dress," and high-low isn't my personal style, but it is a pretty dress and looks great on you! If YOU feel confident in it and want to wear it to your prom, DO IT!