Example Team Member and Headshot JSON

headshot.json

{
    "data": {
        "type": "file--file",
        "id": "311f36ae-b233-4db9-84ba-803525307e42",
        "attributes": {
            "fid": 2,
            "uuid": "311f36ae-b233-4db9-84ba-803525307e42",
            "langcode": "en",
            "filename": "gravatar.png",
            "uri": "public://2018-03/gravatar.png",
            "filemime": "image/png",
            "filesize": 83947,
            "status": true,
            "created": 1520006861,
            "changed": 1520006895,
            "url": "/sites/default/files/2018-03/gravatar.png"
        },
        "relationships": {
            "uid": {
                "data": {
                    "type": "user--user",
                    "id": "56e75b23-89c2-42a2-8c20-30c23e44eda8"
                },
                "links": {
                    "self": "http://localhost:8888/jsonapi/file/file/311f36ae-b233-4db9-84ba-803525307e42/relationships/uid",
                    "related": "http://localhost:8888/jsonapi/file/file/311f36ae-b233-4db9-84ba-803525307e42/uid"
                }
            }
        },
        "links": {
            "self": "http://localhost:8888/jsonapi/file/file/311f36ae-b233-4db9-84ba-803525307e42"
        }
    },
    "links": {
        "self": "http://localhost:8888/jsonapi/node/team_member/d56fd5ed-65f8-4f31-b4c0-29f33ea67bfb/field_headshot"
    }
}