What Does Subtleties Mean in Poetry?

Subtleties are very small details or differences which are not obvious.

What do you mean subtleties?

: the quality or state of being subtle. : a small detail that is usually important but not obvious.

What are subtleties in literature?

In literature, subtlety is used to avoid making a detail less obvious or apparent. Subtlety may exist in small differences between two characters, foreshadowing, or perhaps even changes in dialogue or diction. Subtlety may also be referred to as nuance, subtext, or innuendo.