Leading lines, as thirds, is a little mis-understood and generally used by photographers to apply a logic that doesn't really exist.
Where is the line?
There is no line there, just a sensual curve, really the opposite of a line in that it has a free flowing form. It's form is also not in the way of a line but a change in texture and shadow caused by the many boots on the snow. It's the figure in the landscape that attracts the eye, the path does not lead you to it. The path only explains how, and it does it after you see the figure.
In terms of composition it works well in that you have a few well chosen elements. They need centring an balancing. The sky works better if a little less blue.
But how I wish they were two simple and complete clouds...
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