Vector Drawing used to be a big hobby of mine. Unfortunately I don't have as much spare time these days. 
For my drawings I use Corel Draw. The technique is quite different from conventional graphics programs like photoshop. Vector drawings can be up- or downsized to any level without losing picture quality. Also the picture consists of individual vectors each on its own layer. As such, any picture can easily be modified later on. 
Here is a small selection of all the drawings I have made over the years.
The shark


Watching the sunset
F-14 Tomcat
Boeing 747-400
Boeing 737-800
Boeing 757-200
Boeing 777F
MD-11 Take off in sunset
Boeing 777-300
OEBB Talent
KC-10 Tanker
OEBB 1044
Boeing 787

Vector Drawings