Masterwork Impression Work

Masterwork imitation assignment for my college's illustration class. We pick a work we will use as ref, and copy every stroke/colours wherever possible (hence called imitation) - this is so that we can learn how the masters did their works
(also, ironically, it is how we learn the hard way )

....though until this day, I don't know who drew the original work, nor what that work is called =w=; Anyone who knows, please leave a comment here! (my heartfelt thanks sharing )

The preview version and the original reference is here >> [link]

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Time taken: 2 nights, 11 hours+ straight for each day
Medium: Prismacolour pencils on Daler Rowney Murano paper (Apple)

*Original artwork belongs to the respective master, I don't own the masterwork, I only did a copy for my assignment...