Thanks for the contest & congrats to the winners! Lots of funny custom idea!

A small advice or sharing here: you can search "C/Let's Make a Collage" on HIVE,
They hold collage contest every week so their system is good to reference.

As right now it seems like you gain nothing's through your contest.
What make me want to share is the Beneficiaries parts.(see the image)

All the entry post in c/LMAC need to set 20% Benefit back to the contest organizer (which mean you here)

So the more people join the contest & the more votes they earn in their post, you get 20% of the HivePower as well.

Hope this information helps you!