It looks good.
I disagree. It’s a decent depiction of a generic eye, but it’s poor facsimile of the client’s eye. The iris in the tattoo appears larger and lighter than the client’s other eye. If the customer is happy, who am I to judge? But as a great work of Spanish art, I’d rate it only slightly above than this doozy from a decade ago:
https://abcnews.go.com/blogs/headlines/2012/08/elderly-woman-ruins-19th-century-fresco-in-restoration-attempt