Original Drawing from Spice Box of Earth

[BMS]

I recently purchased an original pen and ink drawing that book illustrator Frank Newfeld drew for Leonard Cohen's Spice Box of Earth; the drawing appears on page 3 alongside the poem "Gift". The drawing is signed and dated '61, the year the book was published. I've never seen this type of LC related item for sale or offered in any auction. Has anyone seen something like this before? Can anyone shed some light on this item's value?