How does Jhumpa Lahiri use the minor action and subtle details to express the unmet needs of the characters?

In the short story interpreter of maladies Jhumpa Lahiri uses a lot of minors details to show some of the character aspects such as their personality and their needs. Some of the details that can show the reader the really bad family relationship between the "Das" family are. Mr. Das loves his camera and his pictures, in the story we can notice that he care more about them that what he actually does about his family. During the trip he keeps looking to his book of India trying to highlight good places to visit and to take some photographs, with this two small details that Lahiri uses we can notice that Mr Das is always trying to give himself happiness instead of giving his family it.
An other minor detail that give us a lot of information of the relationship between Tina and Mrs Das (her mom) is Tina´s doll; as we know Mrs. Das has short hair and the doll also does as if it was cut. Tina is always hitting her naked doll against everything as if she was expressing her feelings of lack of attention towards the doll. It could also be what she feels for her mom and what she would like to do because by the small detail as the kid cut the hair of the doll we can see that she wants the doll to look as her mother.
A quote that gives us a lot of information but its something minor because the author does not build on it is when Mr Kapasi ask himself if Mr and Mrs Das had a bad relationship as he and his wife did so with this Lahiri  shows us that Mr Kapasi does not really love his wife and he is constantly comparing his relationship with other´s family´s relationship. and after he says that the reader can feel that Mr Kapasi feels an attraction towards Mrs Das.

I think that Lahiri gives the reader a lot of knowledge of the situation with small details and in my opinion this helps the reader to understand and focus on the story with some sort of images that will pop in the readers mind .