Cityscape drawings

These are my cityscape drawings. They are deceptively realistic images of well-known existing cities the world over but all of it is drawn from imiganation and memory. Although they are drawn in a seemingly realistic manner which is further enhanced by the use of light and shade whenever possible, most drawings also present themselves as highly accurate architectural and perspective studies. 

To produce any of these drawings takes from roughly one week and 25 hours up to five months and 500 hours.