"subtle observations" is a correct and usable phrase in written English.
It refers to subtle or nuanced perceptions or insights made by someone. It can be used in a variety of contexts, such as in literary analysis, scientific research, or personal reflections. Example: "Through her subtle observations, the detective was able to uncover the true motive behind the crime."
Obama offers unusually perceptive and subtle observations of himself and the people around him.
The winning poem, by Patricia McCarthy, which comes at its subject, the Great War, in a tender, oblique fashion, convinced us with its quiet technique and subtle observations.
They were not just thumbnail aides-mémoire but wonderfully detailed accounts of confidential conversations with Britain's high and mighty, laced with wit and subtle observations of character.
In La voz a ti debida (1934; "The Voice Inspired by You"; Eng. trans. Truth of Two and Other Poems), profoundly personal love experiences inspire subtle observations on the solidity of external reality and the fleeting world of subjective perception.
For 20 years, Claire Denis has been among France's foremost filmmakers with her acute yet subtle observations of the ebbs and flows within relationships.
Stephen Beresford's screenplay combines broad comedy with subtle observation.
Vernet's shipwrecks, sunsets, and conflagrations reveal an unusually subtle observation of light and atmosphere.
From intricate plotting to exquisitely subtle observation, she is that rare prodigy: an author who is good at everything.
The Tarnished Angels is a polished psychological melodrama, meticulous in its subtle observation, but only the planes involved in the dangerous flying scenes are strictly of the 1930s.
A distanced and subtle observation of young runners in the Ethiopian highland town of Bekoji, famed for producing some of the world's greatest distance athletes, including Tirunesh Dibaba, Kenenisa Bekele and Derartu Tulu.
The story is set in the future, in 1980, on an imaginary antipodean island called Britannula, and therefore lacks the subtle observation of a recognisable social world for which Trollope's fiction is cherished.
