which of these three are good for my book, nimbus's cover?
nimbus is a sci-fi fantasy novel set in summer 1959 in a flying city called nimbus. The protagonists, Hugh, Sally, Bobby and Icarus must save the city from the terror of the birdmen robots, the hawkers

it isn't a horror story

the covers are
1. adventure: Hugh and Sally running like hell from a hawker about to take them out. back cover shows nimbus in the sky

2. suspense: Hugh is being thrown out a stained glass window by a hawker. Back cover a. shows the window before it shattered and back cover b. shows Hugh dangling from his camera bag

3. fear: pure black cover, with only a hawker head disturbing the emptiness. half the face is in shadow, with a red glow from its eye being the only light on the dark side of its face. back cover is black as the front, only its uninterrupted