ALRIGHT! *thumbs up*
The outline of the dress is quite jagged. It's important to keep lines smooth so the look flowy and natural. Here's a picture:
Another place to improve would be learning how dress folds fall. The upper half of the dress is shaded well, but the bottom half should be more similar to the lower portion of your previous doll (somewhat "U" shaped folds). FYI, Dresses are something I still hate shading.