Hi mate! In the original white paper it was said that upvotes and reblogs shouldn't be a condition of entry to a contest. If you search the #contest tag, I'd hope all the various contest insist on an upvote. Y own contest I've run for 3 years on my @leedsunited account usually gets reblogged and upvoted anyway. Take a look and get your entry in next time lol...
Good luck and its great when people run these contests as they are a great way to meet people and create engagement :-)