This will filter for all Content Items which have the Content Schema "Image Metadata" assigned and for all Content Items which have the Layer "Copyright Information" assigned.

{
    "kind": "AndFilter",
    "filters": [
        {
            "kind": "TermFilter",
            "field": "contentSchemaId",
            "term": "ImageMetadata"
        },
        {
            "kind": "TermFilter",
            "field": "layerSchemaIds",
            "term": "CopyrightInformation"
        }
    ]
}

• The special field: contentSchemaIds has the Content-Type (Virtual Type or File Type) names stored as a value for easy access. 
• The special field: layerSchemaIds has the Layer names stored as a value for easy access.