>>1364335To me: There are no curves on your version of the skirt. They seem to just be straight lines.
Are you using fills or strokes? Your lines could look like that because you are using strokes (If you are using them). One rule that I was taught was to use strokes mostly for mechanical objects.
So far you are doing great. The only thing I see wrong with it is the jagged edges (from the strokes(?)). I dislike how the outline is so thin, but then again that is something that could make the vector amazing. You also have an inconsistency on the skirt which I have highlighted. Another question: Is this your first time doing a vector? If so I would recommend looking up some tutorials on how to use the pen tool. Good luck!