I first saw it as CW. If I look at the more "outstretched" hand when it appears to be crossing the sillouhette in the "back" and imagine it instead to be crossing in the front (or vice-versa) I can switch most easily.
The CW one looks more like your looking slightly down on her, whereas the CCW one looks like your looking up at hersomewhat... maybe why the CW is the first one that tends to be seen.
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