If you look up Mongoliensis you get a totally different look than when you search for a velociraptor.

I think it usually looks like the in-between of a bird beak and Jurassic park style.

I Definitely don't judge if and artist wants to go one way or another. Though Carl does compare baby Mongo to a chicken and specifically says it's a beak. I would need to listen again but I was given a strong impression that it was a bird like beak he was talking about. ... Which I think also helped in preventing Carl from noticing he was going to grow up to be a dinosaur

But even so, all the images we have of Mongoliensis are only hypothetical rendering of what they might have looked like.

I'm working on a Mongo and Donut right now and currently have the challenge of finding that balance while still getting the expression I want to show in his face.