I did notice something about one of my sculptors. This mainly happens on the ice. The sim starts the sculture, the first sections breaks away, the second section breaks away and when the progress bar is halfway the ice breaks away and they are done with the sculpture. At first when it happened, I thought the ice broke, but, then I looked and they were done. I don't mind, but just seems kind of weird.
Also, I have two level 10 sculptors. One sim I made specifically for sculpting, traits, LTH wishes. The other one is his ghostbuster wife that kept taking his sculpting table, so I got her one. Well, she reached level 10 in no time and her pieces are more expensive than his and she gets more brilliant and masterpieces than he does and her traits and LTH wishes are not even close to sculpting. I tried an experiment and they even finish at the same time and he even finished the challenge to finish faster.