Loose linework

A few weeks ago I was experimenting with different types of linework when sketching architectural subjects (or anything for that matter) Well this evening I was practicing these on a photo of a building that I am very keen to sketch in real life... Sometimes it is hard to have the opportunity or the energy to get out to different parts of Sydney. Traditionally I use #1 or #4 when I have a complicated building in front of me and I am either too tired, ratty, my bag is too heavy, or running out of time (or all of the above) All four are great ways to loosen up as well.