Here are the links to the current drawings of tanks and other AFVs*.
Centurion, Hetzer, Jagdpanzer IV, OT-34, M4A1 Sherman, Elefant, Pzkw V Panther, Jagdpanther, Pzkw VI Tiger I, Pzkw IVH, Comet, M1A1 Abrams, PzKw VI Tiger II, KV-1, KV-2, Sturmgeschütz III
For the drawings of AFVs, I use photographic references, other drawings and schematics. The references I use are books from Schiffer Books, Concord Publications, Signal Squadron and several other books.
These drawings are usually done with pigment ink markers from Eddings, Artline, and a few others. The sizes I use most frequently is 0.3, 0.1 and 0.05. For large shadows, I simply use a big black Copic marker. For the ones in colour, Copic markers are used.
These drawings are normally completed from start to end in two to three hours.
*AFV - Armoured Fighting Vehicles
"If the tanks succeed, then victory follows." Heinz Guderian