Hi
My name is Mihajlo.
Take a look on my portfolio here at Freelancer.com
https://www.freelancer.com/u/SenseiMikkicca
There you can find hundreds of B.W. drawings(charcoal,chalk,ink,pencil,pastel etc..)in variety of art expressions(caricatural,realistic,less or more detailed..),different arts(comic style,storyboarding sketches,illustrations,caricatures etc..)and topics(S.F.,historical,adventure etc..).Also couple of comic B.W. pages are on zombie theme.
I work traditionally free hand and digital programs I use in retouch of art works(you would receive high res samples in 300-600 DPI).
Let me know if you estimate my art style is appropriate for your project.
Regards.