Thanks for your input Frank.
However I don't think a "all in one poll" thing would work because then it's possible some entries get almost all the votes and some none, making it harder to set up new rounds. It would also become chaotic if you need to scroll through 32 pictures and then desciding where your 3-5 votes go to.
At the moment the voting is "spread" over multiple polls in multiple rounds, so you have as many votes as there are polls in that specific round. There are always two entries in one poll so they can be easily compared.
Note: The order in which the entries are ranked is made by the people who join the competition. The first person who sends in an entry will be entry number 1, the second person entry number 2, etc etc. Because nobody knows who (and when) sends in an entry, the entries are randomly ordered. Sometimes the same people or the same kind of entry (for example both entries include a WW2 German soldier) are in one poll, but that's just coincidence.
The competitions and duels are made for people as a stimulation to paint (something new) not as a serious competition with prices. It's all about fun. Of course it's sometimes hard to descide who you vote for but that's part of the fun.
People are free to join competitions on other websites, as much as they are free to join the competitions here.