There is no question of 'look' being a copular verb in this sentence. If 'look' is considered to be an intransitive verb, the preposition phrase may be regarded as an obligatory adjunct. That does nor make 'look' copular.
"In the same section they state that copular verbs are followed by a subject complement or an adverbial and occur in types SVC and SVA." That is not to say that all verbs that function in this way are copular verbs.
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