A dome deciding the punishments is a good idea. It's also possible to make a list of punishments (and order them from easy to difficult) and just give a round's loser the next one at the list.

Hi everyone,

I would like to ask your opinion about the following game.

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Players: 2 - 9999

Rules: Play an easy word game at the chat, e.g. missing letter
The loser of each round should turn his/her webcam on and do a predefined task/punishment in front of the camera.

Winner: As ...

Please, give me your opinion...

And if you liked it, maybe you can create a similar tease (with other pic's and questions),
so I can play it too...