Alive is a personal project by the German designer and Illustrator Andreas Preis. He designed this amazing posters series
Check Your People by Andreas Preis // http://society6.com/designerpreis/Check-Your-People_Print
Landyachtz // Longboard Graphics // 2013 by Andreas Preis, via Behance
3 Animal Portraits by Andreas Preis, via Behance
Grow by Andreas Preis, via Behance -- this would look amazing as a back or chest tattoo!
Cable character design by Ed McGuinness (for Avengers X-Sanction)
The drawing shows myriad curvilinear lines of varying thickness and direction. These lines give the forms definition.