I'm curious why Hans doesn't suspect Marie completed the sculpture considering that a) she met him outside and told him to go back inside, which would start the period in which Hans wasn't present at the statue, and b) she ended up with a cold the next morning, which would have indicated a long period of time out in the rain as she said to Hans. I know there's an assumption that a master sculptor needed to have done it and that Marie is neither a sculptor nor conspicuous with her talents, but you'd think that if no one else that was working on the statue fit the bill, the small girl who has been helping out and was present at the statue around the possible occurrence time may have something to do with it.
Also what exactly changed with the sculpture anyways? It only looked like someone puked on it with magic glitter.