How do you achieve this look?

[nickv7]

Am interested to learn/find out how would you go about to get your image to look like ( or close to resembling) the following image/images by the following photographer.

http://www.modelmayhem.com/pic.php?pid=3097321

Is it done with lighting or mostly in Photoshop? & if it is done in PS, what are the likely steps to achieve a similar look?

Thanks Nick.