Final answer:
Keiko's surprise for Henry was a drawing that Keiko drew of him.
Step-by-step explanation:
The surprise that Keiko had for Henry was a drawing that Keiko drew of him. This is mentioned in the text where it describes a painting of a man standing in a room with a bandaged ear, and to his left is a blue framed window.
The painting also shows a Japanese woodblock print with two geishas in a landscape.