"not a" vs "not any"

Hi there, are both not a and not any sound natural in the following examples?

  1. Yesterday was mothers' day but I did not post any photos with my mother on social media. I think importance of my mother to my life cannot be described by just clicking pictures or posting them on social sites on mother's day.
  2. Yesterday was mothers' day but I did not post photo with my mother on social media. I think importance of my mother to my life cannot be described by just clicking a picture or posting it on social sites on mother's day.
  3. Yesterday I visted a tiger reserve for the first time. After searching for hours I could not find a tiger.
  4. Yesterday I visted a tiger reserve for the first time. After searching for hours I could not find any tigers.
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