Yes, she does gravure. Don't think any of it has shown up here before though. Suspect she does it more for the publicity and would really rather have a music career instead.
Also the google translation of the description (which is bad) sounds kinda promising ...
''Image of idol Yamanaka Mayumi -chan . Mayumi -chan boasts outstanding popularity from junior era , until the low-rise , which would see the crack of ass from T-back , it gave us the challenge of extreme shooting .''