Drawing by Adelina Popescu
Pietro Annigoni disegno su carta by Carlathos
Franz Fedier (Swiss, 1922-2005), The front of 7, rue Rachel, 1949
sketch2, by Isaac Tobin
"Venice" 2004 Richard Britell
Drawings & watercolours by Łukasz Gać, via Behance
Here's a helpful free lesson on drawing in pen and ink!