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The vaccination is literally at the center of the image and both characters are looking at it…

Disagree. The patient is hiding her face in her shoulder as she shyly offers her arm. Her eyes are ambiguous.

I have to agree with tasogare that the focus is the vaccination and both characters are looking directly at it.

Here is larger version that clearly shows their gaze: https://pbs.twimg.com/media/ExdDvo_WUAEmp6g.jpg

Still don't see it. The patient's gaze is puzzlingly higher up her arm.