Final answer:
Henry's character as depicted through the act of writing a postcard in Henry James' narrative might be reflective, introspective, or communicative, aligning with James's literary realism and psychological depth.
Step-by-step explanation:
Without additional context about which of Henry James's works or characters this question refers to, it's challenging to provide a specific character analysis for Henry's act of writing a postcard. However, drawing from Henry James' narrative style and character development, often found in his literary realism and psychological depth, writing a postcard could illustrate his character as reflective, introspective, or communicative. These qualities are deeply rooted in James's trademark writing style, where characters often engage in activities that reveal their inner thoughts and complexities.