Cool art and useful tutorials…
Rooftops by Matej Jan
It is an illustration for [this Hacker Comics cover](http://matejjan.com/post/66162794481/third-and-final-fake-comic-cover-for-the-web).
It comes with two tutorials:
My waking hours are spent doing graphic & web design, but as night settles in Tumblr is where I lurk, posting art/photo creations and other random stuff. Go forth my little tadpoles and explore!