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'have looked' is correct and usable in written English.
It is the present perfect form of the verb 'look' and is used to refer to an action which has occurred in the past and has a connection to the present. For example, "We have looked through all the documents and found all the relevant information."
Exact(60)
I must have looked unsatisfied.
"I must have looked awful.
He should have looked down.
I must have looked terrible.
I must have looked skeptical.
They should have looked critically.
I should have looked.
Schaub must have looked on in awe.
Haye could not have looked less troubled.
The list could have looked very different.
Normally, this would have looked blimpish.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com