I got the photo reference for this from the Art of Tibet Knowledge Cards, and then simplified the silver patterns slightly. This is a shell trumpet with silverwork made in 18th century Tibet. I thought it was gorgeous.
This was done in a grisaille technique with graphite, and then sprayed with fixative and tinted with coloured pencils.
Materials I used:
Staedtler 2H pencil
Faber-Castell 4B pencil
Faber-Castell Polychromos coloured pencils
Prismacolor coloured pencils
Krylon Workable Fixative