This is a creative challenge taking place irregularly. In 2019 it's February 11th to 17th
What's the challenge? Draw or write about original characters (fandom-based or completely original) kissing.
Where and how to take part? Post anywhere, using the tag “ockiss19”
This is a creative challenge running annually from November 1st to 30th
What's the challenge? Draw things that are new to you/that you have never drawn before, ideally one per day
Where and how to take part: Post anywhere, using the tag “newvember”.
This is a creative challenge running annually from November 1st to 30th
What's the challenge? Draw dinosaurs, ideally one per day
Where and how to take part: Post anywhere, using the tag “dinovember”.
This is a creative challenge running annually from November 1st to 30th
What's the challenge? As a counterweight to "goretober", draw pleasant scenes, ideally one per day
Where and how to take part: Post anywhere, using the tag “nicevember”.
"OC" standing for "Original Character" here. This is a drawing challenge running annually throughout September
What's the challenge? Draw your OCs, ideally one image per day.
Where, how to take part: Post anywhere using the tag "oc-tober".
This is a drawing challenge running annually throughout September
What's the challenge? Draw stuff to the topic "sleepy".
Where, how to take part: Post anywhere using the tag "sleptember".
This drawing challenge entails identifying one thing you're bad at drawing (e.g. hands, machinery...), and draw 100 of that thing.
It seems to go back to a video on ctrl+paint.com
This is a monthly art challenge. In a community on DeviantArt, a colour palette is posted, and you have time until the end of the month to create an image using that palette.
More information at www.deviantart.com/colour-schemes
This is an art challenge to pick one theme, and design 100 based on it.
Original video by Jake Parker describing the challenge
This is a drawing challenge running from July 1st to July 31st
What's the challenge? Draw animals from a prompt list that has one per day.
Where, how to take part: Find the prompt list (2018 at FB, 2018 at Twitter), draw, post to FB or anywhere using the tag "zoolyartchallenge".