She is often shown gathering wheat; some designs weave the "M" glyph into the patterns of her hair. Her virginal nature suggests Virgin Mary themes for those with a Christian bent; popular images of Christ's mother can be tastefully incorporated into a design that, for clarity's sake, would ideally incorporate the glyph.
For a real break from convention, consider that sidereal astrologists, who take a different view of the constellations than the tropical astrology popular in the West, view the female figure in the stars as a fertility goddess. According to sidereal astrology, she could be Ishtar, a promiscuous goddesses who destroyed her lovers, abandoned them or turned them into frogs. To make things interesting, your virginal harvest-gatherer could have a hint of Ishtar.
The stylized "M" naturally lends itself to the tribal style. Tattoo artists often surround the glyph with flowers, birds or other adornments. To really make your glyph stand out, you can play with those curlicues--the one on the left and the figure eight on the right. Turn them into serpents; the humps of the "M" might be archways leading to a garden of earthly delights. We might even see the maiden in the background, beyond the pillars.
For a dazzling and unique Virgo tattoo design, consider a glowing sapphire. The bright blue surface is interrupted by bright flashes of reflected light on the outside and swirling shadows within. The pattern of light and shadows can be rendered in the shape of the stylized "M."