eye-of-god

A person who has a fine eye, a man or woman who can notice/spot very small and fine details, never missing something from his/her line of sight, uncommon details and almost impossible to notice by an average person.

S1:I don't understand, he has such a fine eye, he spots every small detail, even I can't see them at first sight.
S2:Since he notices every detail and has a fine eye I guess your boyfriend has the eye-of-god.