This was also done in 2012 (I did so many portraits back then o.o)
Took me around 40 hours and this drawing has two separate speedpaints ^-^
http://youtu.be/OczBtXOE6ak
http://youtu.be/_TChS7sZc7A
Combined, this drawing took me around 40 hours to finish ~
Link
Rex ForestWanderers
Amazing detail!