The brown under the buttons reads as the background, making the part on our right seem like her left arm, not simply the other side of the dress. Also, just checking that you know her left breast is jaggy.
It just gives the illusion that her breast and her arm are connected. It isn't really. It just looks that way because of the dark part on the dress/top. Look at the wip link to see what I mean. It's something that can be fixed up a little though. I still love this work.
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This is gorgeous!