Sacred Skull Tattoo

Hello... welcome to 2013, and my 2nd late post of the year.

So, as some of you who have tattoos may know, it becomes an addiction... I've done my first after 5/6 years planing it, the second one after 5 years, and its been just over half a year since I've got it... and immediately wanted more. After some sketches, these ones are at the moment the most close I've been of nailing them... yet, I'll keep sketching a little more, just to have certain of the finishing picture.

P.S.: I'm aiming for my left ribs.