You can add up to 8 photos to your competition before publishing and the first one uploaded will be used as your competition's main image. The image ratio is 600px x 707px.
A promotional image is used as a meta image when sharing your competition online. it is also used as a thumbnail that is displayed on top of your promotional video if one was uploaded. The image ratio is 1200px x 675px.
Images cannot be added, changed or deleted once a competition is live.