Streak Club is another website I made last year for encouraging people to get together and do something creative on a regular interval (daily or weekly) in order to improve. Although the year is over there are a few drawing streaks going on that you might be interested in!
- Daily Art 2015 - draw every day for 2015
- Advent Streak - draw a little thing you might see in an advent calendar for december
- Planet Princes/Princesses - Create a prince/princess for each planet (sadly almost over)
Streak club lets you submit to multiple streaks at once too, so you could be in daily drawing and still submit to some of the shorter drawing streak. You can browse all the streaks here: https://streak.club/streaks