Yes. About that. It's funny how a word can have multiple connotations depending on the intended usage.
Your "not good image" is related to a life situation - unpleasant scenery, a disturbing thought. From the writer's point of view, this was the good image because it was able to ignite the feeling in a reader, regardless of the nature of this feeling: pleasant or unpleasant. The "not good" image would have been the one that wouldn't ignite any feelings, leave a reader indifferent.