https://www.epo.org/en/node/what-form-can-artwork

What form can the artwork take?

You can submit any kind of artwork: For example, the artwork can be a drawing, a painting or sculpture, installation, etc. The only requirement is that your submission should be a photograph of the artwork or digital art (JPEG file (.jpg) in a high-resolution format: min. 2 000 pixels wide and 300 dpi). To protect the privacy of the children involved, please ensure that the children’s faces, names or any clearly identifying features are not in any way visible in the submission.