Pixar has unveiled a new piece of concept art from their prehistoric animated adventure The Good Dinosaur, featuring a new look at Arlo the Apatosaurus, voiced by Lucas Neff.

The story centers on Arlo, a teenage dinosaur who befriends a young human boy named Spot. The movie hit a snag in August 2013 when original director Bob Peterson was dismissed, which caused Pixar to push the animated adventure from its original May 30, 2014 release date all the way to November 25, 2015. Over the past year, new director Peter Sohn has been reworking the story, and while the basic premise remains the same, the filmmaker revealed to The Los Angeles Times that a lot has changed.

"The heart of the story remains the same. It's always been about this young dinosaur growing up. But the world itself has changed a lot. Nature has become a character."

Pixar's general manger Jim Morris revealed how tough it was to move the release date back, which also pushed the sequel Finding Dory into 2016 and caused the studio to lay off 50 employees.

"For Pixar it was a dramatic event. It was tough on the company. Most studios would have said, 'The movie's fine. It's not bad.' And it wasn't bad; it just wasn't great. We wanted to have a great movie."

The film is still based on the notion that an asteroid never hit the Earth and wiped out the dinosaurs, and follows Arlo taking on the young boy Spot as his pet. Peter Sohn discarded some of Bob Peterson's ideas, such as modeling the dinosaurs after Amish farmers, while adding nature as an antagonist.

"When Bob was taken off, I was supporting the film as best I could. It felt like, this child, this film still needs to be raised. It was just about how to take care of the thing at that time. Trying to keep the original vision of this film intact and trying to plus it as well."

Take a look at the new concept art for The Good Dinosaur below.