Fresh eyes sounds like something you'd see at the Fish Market, but it's much less scary!
Once you pour your entire soul into your essay at 2 a.m., you can't see it with fresh eyes anymore. It's part of you, like your tired eyes.
Even the next day, your eyes are something less than fresh. You need to show it to somebody else. Somebody who knows how to write English sentences and can suggest corrections and edits.
If you give me your essay, it will come back ready for handing in!
PETER THE PROOFER HAS FRESH EYES FOR YOUR ASSIGNMENT!
HE WILL GET IT RIGHT FOR YOU.