In the pictures he enriches a certain lustre (5)

I believe the answer is:

sheen

'lustre' is the definition.
(I know that lustre can be written as sheen)

'in the pictures he enriches a certain' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SHEEN' can be found hidden inside 'pictures he enriches certain'.

(Other definitions for sheen that I've seen before include "Polish" , "Patina" , "Radiance" , "Acting family" , "Sureface shine" .)

I've seen this clue in The Irish Independent.

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