People who seem diligent might be:
Working (apex)
acumen
a person smirking
A person handing out pamphlets
Napping on a couch
A person handing out pamphlets
A picture of a person.
Noun. It is a person. Remember the definition of a noun.
diligent
acumen
A person smirking
a person smirking
Napping on a couch
A person laying on a couch.
A person handing out pamphlets
diligent
A person handing out pamphlets
A person lying on a couchA person lying in bedA person lying on a couch