This is the 14769th most frequent Turkish word.
resimlerinin
"Resimlerinin" means "of his/her/its pictures" or "of their pictures" in English.
The word "resimlerinin" is used in the possessive form here, indicating "their pictures," referring to pictures belonging to someone.
Resimlerinin güzelliği herkesin dikkatini çekti.
The beauty of their pictures caught everyone's attention.
In this sentence, "resimlerinin" refers to "of their pictures," where it's used to describe details related to the pictures that belong to someone.
Resimlerinin detayları çok etkileyiciydi.
The details of their pictures were very impressive.
Here, "resimlerinin" indicates "pictures belonging to" and is possessive describing ownership by someone mentioned in the sentence.