Ngrassi, it's customary for the previous judge to announce the winner in the same thread he/she started his/her contest in. Look at the FTC and CC threads, you'll see what I mean.
Also, I'm sorry, but I don't envision a "random comic contst" to do too well. This would be just as well put into "RMDC". Don't feel bad. It's not like you've been here too long, so you shouldn't expect things to just work all the time.
FTC was a stroke of luck.
The standard CC was a simple idea that took off amazingly well.
Just read, post, and think about it if you REALLY want to start a new contest. Keep in mind that the CC is done by chosing a topic and general rules for the comics to be posted, and the FTC is all about finishing the third panel of a comic.
Good luck.
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Do you want ants? Because that's how you get ants.