Photograph capturing an island in it, being especially good at keys? (9)

'photograph capturing an island in it being especially good at keys?' is the definition.
I can't tell whether this defines the answer.

'capturing an island in it being especially good at keys?' is the wordplay.
'capturing' means one lot of letters goes inside another.
'island' becomes 'is'.
'in' indicates putting letters inside.
'being especially good at keys?' becomes 'pic' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'an'+'is'='anis'
'anis' going into 'it' is 'ianist'.
'ianist' put into 'pic' is 'PIANISTIC'.

Can you help me to learn more?