Random Dinosaurs: Random Dinosaurs #1

This is just a collection of random dinosaurs. You may suggest dinosaurs for the next artworks in the comments. Hope you like it.

What are these dinosaurs?
Deinocheirus: https://en.wikipedia.org/wiki/Deinocheirus (Deinocheirus - Wikipedia)
Tapejara: https://en.wikipedia.org/wiki/Tapejara_wellnhoferi (Tapejara wellnhoferi - Wikipedia)
Irritator: https://en.wikipedia.org/wiki/Irritator (Irritator - Wikipedia)
Psittacosaurus: https://en.wikipedia.org/wiki/Psittacosaurus (Psittacosaurus - Wikipedia)