Triceratops is certainly among the most popular dinosaurs. Here is my restoration from 1990/91:
... and here is my latest restoration (January 2015) of a juvenile specimen:
One of the ceratopsians with very distinguished bone frill was Pentaceratops (my restoration from 1990)
Torosaurus with young (2001). There are some theories claiming that Torosaurus is in fact an ontogeny stage of Triceratops.
The main predator feeding on Triceratops was Tyrannosaurus rex (1993)