When creating art, an artist naturally integrates their whole self, including their abilities, knowledge, beliefs, emotions, and even transient moods. Preventing these aspects from influencing the creative process is nearly impossible, even with conscious efforts to suppress them.
However, the question of whether others can perceive these elements is a different matter altogether.
It is not uncommon for viewers and critics to try to interpret an artist's emotions or mental state through their work. By studying an artist's collection of work produced over an extended period, it may be feasible to recognize broader elements of their philosophy and personality. For example, Goya's "black paintings" stand in stark contrast to his earlier formal works, and Picasso's self-portraits provide insights into his self-image.
Although an artist's work may reveal certain patterns or themes, discerning the emotions in each piece is significantly more challenging. Viewers are not mind readers, and their perception of an artwork is often influenced by their perspectives and experiences. Even art critics, despite their knowledge and contextual understanding, are restricted by their subjective viewpoints.
In summary, while an artist's mood or emotions may inherently affect their artwork, it is not always feasible for viewers to accurately perceive these feelings. Any interpretation is likely to be influenced by the viewer's personal experiences and personality, making it difficult to conclusively identify the artist's emotional state in a specific piece of art.