It's not fair that one person chooses the winner for the contest. Contests should be chosen by the public, not by one person. Here is an example of how a contest should be run.

https://www.nannysworld.com/raffles-contests/

I will add your Christmas Card contest to my Contest Database and let the Public decide whose art is best. If you don't do it this way, then the contests are rigged and are only done for profit, rather than thinking about all the time people spent in creating the artwork.

https://www.nannysworld.com/creativity-contest-list/