What does sustained studies mean in art terms?

In art terms, "sustained studies" refer to ongoing, in-depth explorations or practices that focus on a particular subject, theme, or technique over an extended period. This approach allows artists to develop a deeper understanding and mastery of their chosen area, often resulting in more nuanced and refined works. Sustained studies can involve repeated observation, experimentation, and reflection, fostering a deeper connection to the artistic process and the subject matter.