I usually don't post on deviant art the 30 minutes challenge. But this one is pretty popular on my tumblr so... Why not?
About the 30 minutes art challenge. You have 30 minutes to draw something on a particular theme. Every day, one for european and one for american. It's really fun and it's a good exercise. But sfw and nsfw are both accepted. So I don't think I should post the link on DA.