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It's indeed easier to see Gabriela at dusk. Imagine she's lying on her back and we just see her face's profile, going from her hair to her chin. Since the features on the mountain are mostly symmetrical, we can go from left to right or vice versa.

In the first case, the left side of the hill going up is her hair. The center-left dip is her eye, then her nose rises and lowers (two bumps) followed by her mouth (the center-right dip). Finally her chin is the rightmost bump.

In the second case, the far right bump is her hair rising. Then we move left along her forehead, the center-right dip is her eye, then her nose rises and lowers (two bumps) followed by her mouth (the center-left dip). Finally the slant of her neck is the slope of the hill on the left.

And yes, it's far-fetched and it could be anybody's profile, not just hers.