How to draw an owl

How to draw a realistic owl with mixed media on gray paper.
Final picture: http://www.marcellobarenghi.co....m/2013/06/drawing-ow
Music: Route 66 royalty-free music from
https://www.audioblocks.com/st....ock-audio/route-66-f
Materials used:
pasteboard (vegetal paper - light gray) 35x25 cm 1,5 mm, typically used for frames, cartonnage and binding),
9B, 7B and B pencils (Caran d'Ache grafwood),
paper stomp,
Ecoline,
colored pencils (Caran d'Ache Supracolor Soft Artis),
fibre tip pens (Staedtler Noris Club 320 Double Ended Fibre Tip Pens),
markers (Tria Letraset),
pens (Pitt artist pen Faber-Castell and Stabilo Felt Tip),
black and white acrylic (Decoart and Pebeo),
white gel pen (Pentel Hybrid Gel Grip k118-LW),
brush Lefranc & Bourgeois 2 INT 1 polyamide effilé-tapered polyamid
Time taken: 3 hours and 50 minutes