I struggle to perceive seriousness, or paying attention, as being expressions of emotion.
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I'd think flat affect would look blank and unreadable, facially. What do you think?
I agree, but think there has to be an expectation for an emotional expression to be present for somebody to perceive flat affect.
I have no idea what emotion you are expressing in your picture, and I am equally unsure of why you might be expressing it. People more insightful than I in this area, e.g. most people, might be more successful.
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'You seem very clever at explaining words, Sir,' said Alice. 'Would you kindly tell me the meaning of the poem called "Jabberwocky"?'