Synonyms for First impression:

• n.

  •first blush (noun)
  • first light,
  • prime,
  • morning,
  • Brightening,
  • outset,
  • break of day.
  •Other relevant words: (noun)
  • peep of day,
  • first brightening,
  • first sight,
  • first blush,
  • first flush of morning,
  • early morning,
  • crack of dawn,
  • brightenings.

• Other synonyms:

  •Other relevant words (noun):
  • gambit,
  • first stage,
  • alpha,
  • first step,
  • initial,
  • opening move,
  • breaking-in,
  • glance,
  • primitiveness,
  • initiative.