Which shot would provide the most detail on a character's facial expression?

A close-up shot is particularly effective for conveying a character's facial expression because it focuses closely on the face, allowing viewers to see subtle nuances and emotions that might be missed in wider shots. In a close-up, the character's features occupy a significant portion of the frame, which highlights their eyes, mouth, and the slightest changes in expression. This level of detail fosters a deeper emotional connection with the audience and enhances the storytelling by emphasizing the character's internal state.

In contrast, other shot types like long shots and medium shots offer a broader perspective that can include the character's environment and actions but typically do not capture facial details as vividly. A medium close-up strikes a balance between showing the character's face and including some background context, but it still does not match the intimacy and detail that a full close-up provides. Thus, the close-up is the most effective choice for showcasing facial expressions and emotional depth in a character.