First of all this is a picture made to have practice with human anatomy and lighting.
Luckily I had the opportunity to sketch from live with a male model. The agreement was simple : he wanted a quick nude portrait of himself for his office-wall ( yes office...do not ask me what he got in his mind, he is a quite crazy architect) and I asked for payment a whole afternoon as my model. I had only 1 must : do not show his face.
During this afternoon I created tons of pencil-sketches then I chose 6 of them and I realized 6 "pics-prototypes" :
Horizontal Ones : http://aureamediocritas.com/images/itchings/PreviewHorizontals0.jpg
Vertical ones: http://aureamediocritas.com/images/itchings/PreviewVerticals0.jpg
I'm not able to describe the "selection process" cause we had a simple talk drinking a coffee but as result we obtained a "I want 2 pics"!

Me : an ephebic man sleeping in a soft pose
He : an elegant man in warm tones.
So this is the second one : http://aureamediocritas.com/images/am/gallery/Nude-Man1.jpg
HOW I realized them :
Well, starting from the prototypes, I developed his body following my pencil-notes. Then, I used as strong and fixed and, thanks God, STATIC reference my quilted-blanket. It helped a lot cause honestly I'm not able to describe this kind of "folding" without looking at a reference... but of course, I learnt a lot of things with this kind of exercise. It took 12 hs for the first one and 7 for the second.
All painted under painter plus a curve-manipulation to enhance the light under photoshop.
Hope you like them,
Serena.