If I'll be strictly formalist, I will only look at the compositional elements in his portrait paintings: the use of dark tones, the play of light and shadow, the central positioning of the subject, the brightened background, the illumination of the face that creates visual layers, the lines that separate the foreground and the background, the brush strokes that create texture for more visual layers, even the size of the paintings, if I want to be mathematical, I can plot points to measure angles and distance all for finding out about compositional balance, and many more.
That is why I noted that pure "Greenbergian" Formalism was doomed to failure. It limited the discussion to only that within the painting itself. Art for Art's Sake or
art pour l'art admits that the viewer will bring his or her own baggage to a work of art... but rejects the notion that these external non-art elements are at all relevant to judging a work of art. Oscar Wilde's Preface to The Picture of Dorian Gray is probably the best distillation of this approach to looking at art:
The artist is the creator of beautiful things...
The critic is he who can translate into another manner or a new material his impression of beautiful things...
All art is at once surface and symbol.
Those who go beneath the surface do so at their peril.
Those who read the symbol do so at their peril. It is the spectator, and not life, that art really mirrors...
Seeking "meaning" is part of interpretation and has nothing to do with judgment. When we base judgment upon external elements, we get the thinking that lies behind censorship. For centuries the Church deemed certain works of art immoral... and thus bad... because they were viewing art through their dogma. This is no different than the Marxist deeming this painting "bad":
because it glorifies and reinforces the privilege of the Aristocracy...
Nor is it any different from the Feminist declaring this painting bad...
... because it reinforces societal-based gender stereotypes. Neither interpretation involves looking at the image as an art object with a sensitivity to the visual elements. Again... both interpretations are more about words... attempting to put the visual into words... the attempt to use the art object to illustrate a given theory or dogma... It is the spectator, and not life, (or the work of art itself) that such an interpretation really mirrors...
Will I consider Rembrandt's portraits the best, the most beautiful, the most brilliant, and the most impressive? Nope. For my taste, temperament, penchant for context and narrative, I'll pick Frida Kahlo's self-portraits any day.
I personally prefer Bonnard and Matisse to Picasso... but I can fully recognize Picasso's towering genius and would not think to question the notion that he was the greatest artist of the 20th century.
St. Frida?
"I have spoken to the most intelligent people about art, and
they have not understood; but among those who understand, words
are not necessary; you say 'Humpf, he, ha' and everything has
been said."
-Degas