If you'd rather be more "original" in your interpretation of what a Dino looks like, Gregory S. Paul is an excellent paleontologist/paleo-artist who uses his extensive knowledge of Dinosaur anatomy and reconstruction to realistically show what they looked like (skeletal, muscular, or overall). If you can get to a library and find a book with his illustrations, you can maintain originality while using expert reference images to get a degree of authenticity. And don't forget to have fun!! :)