This is the 15512th most frequent Russian word.
прекрасных
"Beautiful" or "wonderful" (genitive or accusative plural form).
'Прекрасных' modifies 'картин' (paintings), indicating the exceptional quality of the artworks.
В музее мы видели коллекцию прекрасных картин эпохи Ренессанса.
At the museum, we saw a collection of magnificent paintings from the Renaissance era.
In this case, 'прекрасных' pertains to 'девушек' (girls), emphasizing their beauty.
Прекрасных девушек было много на этом мероприятии.
There were many beautiful girls at that event.
Here, 'прекрасных' describes 'людей' (people), implying 'wonderful' as a quality of the individuals.