The crescent moon with a human face draws on the "man in the moon" motif found across folklore and decorative art, where celestial bodies are given personality and gender. Paired with a feminine face here, it leans toward associations with intuition, femininity and the divine feminine often linked to moon symbolism in witchcraft and pagan-adjacent aesthetics. For many it is chosen simply for its decorative, dreamlike quality rather than any fixed spiritual meaning.
Where it sits
This is a wide, horizontal crescent shape with the face and clouds extending outward from centre, so it suits the forearm, upper arm wrapping toward the shoulder, thigh or ribs where the horizontal sweep has room to breathe. Shrinking it down will lose the fine gold filigree on the moon's body and the delicate star linework, so anywhere smaller than palm size will muddy those details first. A flatter placement like the forearm or thigh keeps the face proportions from distorting.
Making it yours
Ask an artist for any of these.