@Miss:
He doesn't, though. Perona, Shyarley, Shakky and even this latest Factory Administrator woman all have unique but pretty faces. He CAN do it, he just doesn't. Hell, back when Robin was first introduced, people used to think SHE had a very unique and exotic look. Now every other woman looks like a Robin clone – even down to the hairstyle apparently.
Hmm… you are right, actually. I don't know what to say to that, no other reason springs immediatly to mind as for why he isn't doing it.
Except maybe that he has established cannon of beauty that he wants to keep.
@Miss:
I know this a stale argument to bring back up, but I feel like her timeskip change was probably one of the worst ones. If not the worst one. Pre-skip Robin was perfect.
On that, we agree. Altough I think most of the changes done to Straw Hats were done for worse, and not for better.
–- Update From New Post Merge ---
@The:
It's funny because some complain that none of the Straw Hats have developed over the years, and Robin had actually showed some. She used to keep a straight face and not show emotions, and now she's more open to express what she feels, not by saying it necessarily, but she makes a lot more facial expressions.
A) That change seems to be exclusive to this arc, since it had not appeared in two arcs beforehand.
B) Getting rid-off one of the defining characteristics of the character makes her more generic, rather then more developed.