When you can not upload your picture to the draw drills, or if you want the picture to show up in an art tag of yours, upload the picture separately from the drill, tag it with “Draw Drill” and other tags if you want.
If you do this, it would be great if you linked to the specific drill as well.
On the plus side, others, including us here at artist-problems, can look through the amazing art you guys create, and possibly even get ideas for the drills! :D
Plus, I like seeing people actually doing the challenges (◡‿◡✿)