Portrait of senior teacher's attractive (8)

I believe the answer is:

headshot

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'portrait' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'senior teacher's attractive' is the wordplay.
'senior teacher's' becomes 'head's' (headteacher).
'attractive' becomes 'hot' (hot can mean attractive).
'heads'+'hot'='HEADSHOT'

'of' acts as a link.

Can you help me to learn more?

(Another definition for headshot that I've seen is " Photo showing just the face".)

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