object/kellerdana/1 matches the site

public static HumanMadeObject KellerDana_1_Influenced()
{
    var dana = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/kellerdana/1")
        .WithLabel("Copy of Huntington Portrait")
        .WithClassifiedAs(Aat.Painting, Aat.TypeOfWork);

    dana.ProducedBy =
        new Production()
        {
            CarriedOutBy = [
                new Person()
                    .WithId("https://linked.art/example/person/keller")
                    .WithLabel("Deane Keller")
            ],
            InfluencedBy = [
                new HumanMadeObject()
                    .WithId("https://linked.art/example/object/huntingtondana")
                    .WithLabel("Huntington Portrait of Dana")
            ]
        };

    return dana;
}

• Metatype classification The second argument classifies the first, not the object: WithClassifiedAs(Aat.Description, Aat.Statement) says this is a Description, and Description is a kind of Statement. The Plain C# form shows the nesting.

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/kellerdana/1",
    Label = "Copy of Huntington Portrait",
    ProducedBy = new Production
    {
        CarriedOutBy =
        [
            new Person
            {
                Id = "https://linked.art/example/person/keller",
                Label = "Deane Keller",
            },
        ],
        InfluencedBy =
        [
            new HumanMadeObject
            {
                Id = "https://linked.art/example/object/huntingtondana",
                Label = "Huntington Portrait of Dana",
            },
        ],
    },
    ClassifiedAs =
    [
        new Type("http://vocab.getty.edu/aat/300033618", "Painting")
        {
            ClassifiedAs = [Aat.TypeOfWork],
        },
    ],
};

Generated from the object the example builds: every property that is set, as object initialisers, with the vocabulary constants where a term is in the registry. The fluent helpers are a convenience, not a requirement; this form and the one as written produce the same JSON.