This is the 18045th most frequent Russian word.
фотоиллюстрации
Photographic illustrations.
Here, 'фотоиллюстраций' is used in the genitive plural form to describe the types of illustrations present in the book.
В книге было множество красивых фотоиллюстраций.
The book contained many beautiful photo illustrations.
In this sentence, 'фотоиллюстрации' is in the accusative plural form, indicating the direct object of the verb 'создала' (created).
Она создала потрясающие фотоиллюстрации для журнала.
She created amazing photo illustrations for the magazine.
Here, 'фотоиллюстрации' is in the nominative plural form as the subject of the sentence.