http://schema.org/Photograph
https://www.schemaapp.com/tools/jsonld-schema-generator/Photograph/


<script type='application/ld+json'>
{
	"@context": "http://schema.org/",
	"@type": "Photograph",
	"commentCount": "comment count",
	"copyrightYear": "Copyright year",
	"creator": "Persoon",
	"dateCreated": "EXIF",
	"datePublished": "Postdate",
	"discussionUrl": "Connonical self",
	"fileFormat": "mime-type",
	"genre": "category",
	"headline": "post Title",
	"isAccessibleForFree": "true",
	"isFamilyFriendly": "True",
	"keywords": "Post tags",
	"license": "url copyright page",
	"thumbnailUrl": "URL thumbnail",
	"alternateName": "post title",
	"description": "post Decription",
	"mainEntityOfPage": "canonical url"
}
</script>

WP_Post Object
(
    [ID] => 4985
    [post_author] => 1
    [post_date] => 2018-06-16 08:30:00
    [post_date_gmt] => 2018-06-16 06:30:00
    [post_content] => 
    [post_title] => Florals #1/3
    [post_excerpt] => 
    [post_status] => future
    [comment_status] => open
    [ping_status] => open
    [post_password] => 
    [post_name] => florals-1-3
    [to_ping] => 
    [pinged] => 
    [post_modified] => 2018-05-19 21:11:33
    [post_modified_gmt] => 2018-05-19 19:11:33
    [post_content_filtered] => 
    [post_parent] => 0
    [guid] => https://www.funsite.eu/?p=4985
    [menu_order] => 0
    [post_type] => post
    [post_mime_type] => 
    [comment_count] => 0
    [filter] => raw
)


Array
(
    [width] => 2048
    [height] => 1370
    [file] => 2018/05/dsc00378.darktable.2048-sharp.jpg
    [sizes] => Array
        (
            [thumbnail] => Array
                (
                    [file] => dsc00378.darktable.2048-sharp-150x150.jpg
                    [width] => 150
                    [height] => 150
                    [mime-type] => image/jpeg
                )

            [medium] => Array
                (
                    [file] => dsc00378.darktable.2048-sharp-590x395.jpg
                    [width] => 590
                    [height] => 395
                    [mime-type] => image/jpeg
                )

            [medium_large] => Array
                (
                    [file] => dsc00378.darktable.2048-sharp-768x514.jpg
                    [width] => 768
                    [height] => 514
                    [mime-type] => image/jpeg
                )

            [large] => Array
                (
                    [file] => dsc00378.darktable.2048-sharp-1024x685.jpg
                    [width] => 1024
                    [height] => 685
                    [mime-type] => image/jpeg
                )

            [tiled-thumbnails] => Array
                (
                    [file] => dsc00378.darktable.2048-sharp-570x570.jpg
                    [width] => 570
                    [height] => 570
                    [mime-type] => image/jpeg
                )

        )

    [image_meta] => Array
        (
            [aperture] => 2.8
            [credit] => G. Hoogterp
            [camera] => SLT-A65V
            [caption] => 
            [created_timestamp] => 1526316873
            [copyright] => Copyright G. Hoogterp
            [focal_length] => 90
            [iso] => 100
            [shutter_speed] => 0.00125
            [title] => Florals #1/3
            [orientation] => 1
            [keywords] => Array
                (
                    [0] => Florals
                    [1] => the Netherlands
                    [2] => Nature
                    [3] => Lauwersoog
                    [4] => Spring
                )

        )

)