Juan Francisco Casas creates monumental realistic drawings using ball pens.
Many people will have had art teachers say to that you cant get tonal values using a ballpoint pen. This artist definitely disproves their words as he magnifies digital photos and creates huge hand-drawn panels. There is no Photoshop involved it it just skill with a biro.
Check out the article the site is in Spanish but for English speakers here it is using Google translate.
The artist also has a personal website which houses a gallery of works
Sharon Goodnight .. Thanks, I'll show it on the facebook students from my school of design
graph, by the way the article is in Portuguese