I enjoy using a loose line technique when I sketch from life. When I draw on trains and in waiting rooms I have to be quick as the subject can move any moment. With an arranged sketch subject I have more time, usually between ten and twenty minutes. I still like the quick sketch approach.
On this occasion I drew with colored pencils and gel pen and then added further gel pen lines.
After scanning this one I decided to see what a sepia tint would look like.
The original colors
This one also got a digital tint.
The picture below was actually one drawing but I could not get both pages on the scanner.
These are not intended as caricatures, but I do tend to zero straight into a feature that stands out, often the nose or the hair. I generally don't draw an overall outline first but just visulize it. Sometimes this is a disadvantage, and the proportions are off. Other times it adds to spontaneity.