...and his friend, who lent his skill to this one.
 
In addition to this series, titled The Sketch of a Life, del Grosso also works with photography and graphic design. You can see more of his work on his Flickr and Behance pages, and keep up with his latest projects on Facebook. If you're interested in creating your own photo-sketch hybrids, you can also check out his online tutorial for creating images like this.