Nice dress.. but the reason she has her arm over her midsection is because it fits strange.  The waistline was all up in the girls and it was so unflattering and uncomfortable it went back.

I ordered a small, I am a 34C and I generally wear a size 4 dress.  I don't believe it was a sizing issues, it just seemed like the top portion of the dress was cut really short.  If the waistline had been on the waist, I think it would been great.  I even tried it with a wrap around thick belt and that just made it look even worse.  This got returned.