https://www.epo.org/en/service-support/faq/about-us/50-years-epc-kids-collaborative-art-competition/can-i-submit-multiple
Can I submit multiple photos / digital artworks?
Please submit a single JPEG of each artwork. If appropriate, you can create a composite picture of each artwork (e.g., several angles of a sculpture). If the jury deems it necessary, you might be requested to submit extra pictures.