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William said

They can also write "I checked all the following and it all looks good to me". They should not change the ticket to "positive review" unless they have a bit more experience and feel "ready".

I think that the person could also write, "I would appreciate it if someone more experienced also took a look": they should somehow indicate why they're not giving it a positive review.

(I would have liked to make this a comment in response to William's answer, but there isn't a link for that: I'm only able to comment on my own answers. Is this intentional?)