fey-- Ace of Pentacles


Since I don't that much about mandalas I looked it up:
Mandalas may be employed for focusing attention of aspirants and adepts; as a spiritual teaching tool; for establishing a sacred space; and as an aid to meditation and trance induction. According to David Fontana, its symbolic nature can help one "to access progressively deeper levels of the unconscious, ultimately assisting the meditator to experience a mystical sense of oneness with the ultimate unity from which the cosmos in all its manifold forms arises."
The mandala that she is painting on her hand looks rather similar to the Hindu mandala that is shown on the above link.

As for how it ties into the card, still no idea!