To support tags in your component you must add your content type to #__content_types table.

Documentation: Using Tags in an Extension

To support tags in your component, you must add your content type to #__content_types table.

Documentation: Using Tags in an Extension

You have copied the row where:

`type_title` = 'Contact Category' AND `type_alias` = 'com_contact.category'

To create a new row for:

`type_title` = 'Picture Category' AND `type_alias` = 'com_picture.category'

but you haven't copied the row where:

`type_title` = 'Contact' AND `type_alias` = 'com_contact.contact'

to be a new row for:

`type_title` = 'Picture' AND `type_alias` = 'com_picture.picture'