"Avoir l'air" means "to appear" or "to seem".
The adjective following the verbal phrase agrees with the subject of the sentence or with air depending on the nature of the subject and the presence of a complement.
If the subject is a person, there is no rule and the adjective can agree either with the subject or with “air”.
The verb phrase "to look" means "to appear" or "to seem", and can be used both to talk about a person or an inanimate thing.
Depending on the case, the adjective following the phrase agrees with the subject or with the noun “air”.
The subject is a person: the verb can agree either with the subject or with “air”
When the subject is a person, one can imagine that this person has an “air”.
In this case, there is no rule: the adjective agrees either with the subject or with “air”:
She looks happy
She looks happy
In the first case, the adjective agrees with the subject which is feminine.
In the second sentence, the adjective “happy” is masculine because it agrees with “air” and means: “she looks happy”.
Both scriptures are correct and have the same meaning.
The subject is an inanimate object: the adjective agrees with "air"
In the case where we are talking about an inanimate object, we cannot talk about the air it has, but rather interpret it.
In this case, the adjective always agrees with the subject:
This mug looks brand new
This coffee looks strong
Adjective followed by a complement: it agrees with “air”
When the adjective is followed by a complement, it always agrees with "air".
She looks happy as a person who just heard some good news
They look like happy schoolgirls going on vacation
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