Original post here.

Sourced to Old Erotic Art.

Additional provenance by Bacchus on this one:

It turns out to be a 1995 artwork called “Aqua Girl” by Marcus Gray.

Some basic biographical info about Marcus Gray (including this picture and attribution along with a gallery of other works) can be found here:

http://www.thepinupfiles.com/gray.html

Marcus appears to maintain a FaceBook page for his art here:

http://www.facebook.com/MarcusGrayArt

Marcus has at least two books of his work available on Amazon:

http://www.amazon.com/gp/product/0865620601/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0865620601&linkCode=as2&tag=longgoneenterpri
http://www.amazon.com/gp/product/1561632716/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=1561632716&linkCode=as2&tag=longgoneenterpri

Here are some web galleries featuring works by Marcus Gray — there are many more, but these are a few of the larger or better ones I found:

http://nevsepic.com.ua/art-i-risovanaya-grafika/7918-raboty-marcus-gray-74-rabot.html
http://photo.i.ua/user/1128109/141803/

http://www.xdiablox.com/Misc./comics/Artists/Marcus%20Gray%20Art/

Update: Commenter Alan Ralph adds that Marcus Gray also has a DeviantArt gallery, which you can find here.

Bacchus is actively taking image research commissions, and if you have adult imagery you’re curious to learn more about, I encourage you to visit Bacchus’s introductory post for his image-searching service, where you can find details about how to commission him.