Thanks both to you Foulu for coming up with the contribution and as well to Halfhidden for sponsoring the plugin. I think it's a milestone plugin, as it could be used to increase a gallery's popularity for community building sites.
This being said I would like to point out some flaws or issues that could use improvement here. Please don't take my criticism negative - I'm trying to come up with feedback meant to improve the plugin for the benefit of all.
There are some things that need sorting out: what happens if anonymous visitors (guests) comment on competition pics? I tested for myself and figured out that their comment won't be taken into account, so that's fine. However, you need to add this to the instructions: there will be issues if anonymous comments are allowed.
Another thing that doesn't work as expected is the button "Back to competition". If you wen to the "Award point to winner" page by mistake and try to go back by clicking on "back to competition", you close the competition and make the user winner who is selected in the dropwdown.
There are several other issues that leave room for optimization (like the translation).
To make sure that this doesn't seem like a rant I have modified the plugin and added the instructions page. See attachment.