Just checked the T&Cs
"Artwork should be your own original creation. Official Godzilla 2014, original TOHO, or 1998 Godzilla artwork and images cannot be repurposed or re-used in your artwork. When you submit artwork created for this competition, you agree to give permission for Imagine Publishing, ODEON cinemas, IMAX, and Warner Bros. Entertainment to use your submitted artwork and your name and image for means of promotion, marketing, advertising, both commercial and non-commercial."