I would have someone else take pictures of you while you try it on...then you decide for yourself.
I think this dress works on that model because the bottom is big and she is itty bitty and kinda perched on top of that ball gown bottom.

It is just my opinion but i think the optimal shape goal for plus size should be hourglass. most plus size girls have the hips and the shoulders...why not make a waist or show yours off and just be a larger version of the perfect figure?

I would think more about showing off your best features. An A-line dress is more flattering for plus sizes. anything that cuts in the middle of you if your short, is going to make you look shorter and prob. bigger. Empire waist (under the boobs) makes you look taller. Pleats are the devil. I say again....the devil. ( i don't even understand why they make plus size dresses with pleats on the waist. )
anything that is cut like the one dress above with the over-lay in the V shape is awesome because it creates the illustion of a narrower silloette. (bad speller!)

but the bottom line is, its not the dress that will make you look beautiful on your day, its your level of comfort and happiness. when you radiate happiness and confidence it makes everyone watch your face-not the dress. and if this dress is going to do that for you...then you've found the one.

good luck to you. i'd love to see the results.