Sauropods aren't as likely to have had feathers (or at least, not as many) as Therapods, but Pachy here is a POLAR dinosaur. Yes. Polar dinosaurs were totally a thing and I love them. So I figured... may as well give him SOMEthing of a coat, right? Even if it's just a bunch of quills.
This is a well-drawn picture of a dinosaur!
Cool feathery Ceratopsian, I don't know if it had feathers or not in real life but it certainly looks cool in your art style, and insulation of some sort may make sense if the polar regions of the world were anywhere close to as cold as they are now. Love the details put into its face and neck frill too.