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.