Hello,
The Yellow Wallpaper has the main character a lady protagonist, and it's focused on her perceptions and feelings, that are explained in the whole story.
The reader can understand that the author is telling stories that were lived by him. On the other part, we have that the likes and dislikes of what she sees and shares in the story, could be the author’s own view point and that comes through the character. The reader gets the feeling that the character felt the person she sees within the wallpaper was partly she herself based on certain incidents she had experienced as a child. If we think about the story being told by a third person and not the character herself, we can add more insights on certain situations, such as in the way the wallpaper is perceived by the character. In addition, the story could not communicate that effectively, in a right way, to the reader the emotions felt by the character during the development of the story.