There's a big bit of snow in the hair, and it's got no collar, which every collar must have. At the same time, however, the ideal cut only contains 2-3 pixels beneath the chin. Since in some sources, like this one or the Nagy one, the person in the image may have a longer neck than usual or the collar is lower down, this would be quite difficult to achieve naturally. Here's a technique of how this can be accomplished quite easily:

@Furby Furby, can you post where the source came from? This looks a bit different than the person currently in the megapack.

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