Why do nearly all the social media platforms have nearly the same layout for "user’s post" and how can I implement similar layout in my design?

So I am making an art sharing app ( image sharing ) and have noticed that nearly all the existing social media platforms have similar layout for user's post.

e.g.

  1. Facebook

enter image description here

  1. Instagram

enter image description here

  1. Twitter

enter image description here

Now as it is quite clear from the above pictures that they follow a similar layout which goes something like this :

  1. Profile photo and user name, with follow button if user isn't following that user.
  2. The caption, description, tweet etc.
  3. Images ( if any ) ( in case of instagram, point 2 and 3 are interchanged ).
  4. Then comes the interaction button.

My question is why all of them have Poster's name and profile photo ( optional ) above the content of the post and not below it ? What is wrong with having the poster's name and pic below the main content ? And also, in most of the cases, description is above the image ( if any ) ? Is it because our eyes start reading from top to bottom ?

If so, how can I improve the layout of my app which is just the opposite and quite frankly looks not that good.

Layout of my app :

enter image description here

Red area is for the image ( which is the main content of my app ), I want at least 70% of the users screen to show the image, also I don't want to overlay any buttons or text on the image cause it can hide important details of the picture. What can I do make it look more good and at the same time easy to use ?

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