I feel you.
The same happened to my contest entries and I was disappointed too, but I made sure to lower my expectations once the polls went up. Setting your expectations high will lead to issues when things don't go your way. I've learned this the hard way before.
But don't go too hard on yourself! I'm sure people enjoyed your entries.
My favorite one you made is your Magnificent Memories drawing! And I understand how unfair it can be for the same people to win the events, but if it's any consolation it's not always like that. Just keep at it and you'll get there. Don't give up! You gotta believe!