Here are a few pins from my "Greek Mythology" board on Pinterest that served as great inspiration. And yes, there is a tentacled monster involved ;) So excited to have this one accepted, and can't wait to have it published!
'The Doom Fulfilled' in the Perseus series by Sir Edward Burne-Jones
Perseus and Andromeda byeviltt.deviantart
Perseus with the Head of Medusa by Benvenuto Cellini
Andromeda by Gustave Doré