Ballpoint Pen

Ballpoint pen on A4 printer paper.

This sketch was supposed to be a quick value drawing for a future painting... but I got carried away and spent a whole week on this Dahlia closeup. The drawing is done with a ballpoint pen on A4 copier paper.
Note to self: Next time I spend so much time on a sketch I should at least ensure I am doing it on a better archival paper.