I’d suggest adding small scutes to the side maybe on the shoulders?, and also adding quills at the tail

Is there any evidence that they had quills? I remember quills on like Triceratops being pretty controversial

In triceratops they found skin impressions with quills, so they most likely had quills too

I really like the detail of the broken parietal bone

Ya whenever I made it full it looked weird so I said fuck it and just broke it

It looks cool, you can create a story with the character now about how they lost that ‘horn’? I’m not entirely sure if it should still be considered a horn if it’s part of the frill

maybe slightly thicker legs, you're gonna need muscly legs to carry such a chunky body