Started 1 year ago (2018-01-19T00:00:00Z).
Ended 170 days ago (2018-12-31T00:00:00Z).
Spend 30 seconds to 1 minute on a sketch and continue to new one until an hour is finished.
After an hour, got lots of sketches, feel better, learn something from mistakes.
And post one of them here!
You can use these sites for reference pictures: