This is Not a Photograph: Amazing Portrait Drawn with Ballpoint Pens by Samuel Silva
Drawing-nail t's actually a ball point pen drawing by Portuguese artist Samuel Silva, based on Kristina Taraina's photograph "Redhead Girl." Silva used seven different colored pens and spent nearly 30 hours to recreate the photo.
I still use this method to shade when I use ball point pen. But lately I trying the pencil again x) Ballpoint pen Shading tutorial