Make small - albeit graphic - improvements (7)

I believe the answer is:

retouch

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'make' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for retouch that I've seen before include "Repair a painting" , "Correct painting" , "Make slight improvements to (a photo/picture)" , "Paint over" , "Fine-tune" .)

I've seen this clue in the Evening Standard.

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