Emotions In Tartt's The Goldfinch

Tartt expresses Theo's raw emotions atypically with irregular literary devices. His emotions are swirling inside of him as he is deeply traumatized from his sudden detachment from his mother and, simply put, his "regular" life in general. Tartt sometimes expresses Theo's most painful and intimate thoughts and feelings within parentheses, intrinsically allowing Theo’s pain to be contained, encapsulated, and aloof from the reality of his story. The casual entry of his concerns as Tartt formats them almost reminds me of somebody making sighing self-deprecating comments in the name of humor; to remove the gravity from the context but keep the sentiment.
As time wears on, art created by the human hand grows more and more complex to encapsulate abstract ideas and emotions. Since stiff portraits became fleeting moments captured in impressionism, which then developed into expressionism... It almost seems as if artists are beholding more and more perplexing emotions. The truth is rather contrary; the latest trends in styles of artistry do not inhibit "proper" expression of emotions, but rather, they act as vastly different vessels of expression. Almost like those flavored milk straws, whether the milk tastes like strawberries or chocolate it is essentially still milk; milk being the passions expressed and flavor the movement.
While the age may sound obscure, many famous paintings like Girl with a Pearl Earring and Milkmaid by Johannes Vermeer were executed during