One line drawing technique

When it comes to quick sketching, my lines are usually multiple and light such as the one shown above.

So recently, i decided to try another way of sketching: One line drawing as in like the one shown below. I realised since it is one line, it takes up more time, forcing you to see harder and taking care of where the line should go.






After drawing a few, i gathered it was pretty a whole new thing apart from my usual. Quite a refreshing change.