The Amazing Spider-Man: This piece is made by practicing different styles of crosshatching to build layers of darkness and textures.
The Amazing Spider-Man 2: This piece is somewhat of a followup to the previous one, but is now using stippling to build the textures instead of lines.
Gotham: This series is made with the idea of drawing in reverse. Using only black ink to reveal the white positive space.
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Ink

All pieces made using ink with various techniques.