The Walking Dead #150 2016 Original Art Sketch of Mercer Signed by Charlie Adlard. High Grade Blank Sketch Variant Cover. Robert Kirkman – writer and creator Charlie Adlard – cover/art. NM 9.4 with a great spine and sharp corners. Filed under: walking Tags: adlard, charlie, dead, mercer, original, sketch, walking Comments are Closed on this Post « Pt 5 Delirious Crazy Suzannegladstone Indieartist Indie Originalsong Music Musician GuitarSketch cover blank original art, Negan Walking Dead, by Dan Neidlinger »