The Undefeated Champion challenge ended around October 17th I believe.

The challenges are done on a weekly basis, with topics being posted at midnight on Mondays, and ending at midnight on the Sundays that follow.

Alternatively, you can always post elsewhere in the forum if you're looking to show it off, get critique, etc.

I'd like to add that for most people the contests are posted during midnight but for some it's during the day, depending on your timezone, so always check out the timer on the page of the current contest! :wink:

To enter you just post your entry in the contest topic. Don't start a new one or people won't notice your entry and won't vote for yours.

And just to top it off, here is the full info and rules. :smile:
However, don't be discouraged that the contest is closed - feel free to make your own topic in Finished works or Art blogs and show off your work!