Eurasian Tree Sparrow original artwork, ballpoint drawing popular on paper

Drawing of an Eurasian Tree popular Sparrow (lat. Passer montanus).
Created using ballpoint pen, and white Sakura gelly roll on Fabriano paper.
Paper dimensions: 29.7x21cm or 11.4"x8.2"
Image size: 17x13cm or 6.6"x5.1"
This artwork is sold unframed, with certificate of authenticity.