A concept designer is in charge of creating detailed designs and renderings for video games, animators, graphic designers, and creative directors. As a concept designer, you are making sure everything is visually appealing, and is a correct visual representation of an idea or concept for the final product.
A Concept artist at large production studios like Disney is responsible for pulling from storyboards and creating fully rendered representations of the look and feel the final product will contain. You’ll use Photoshop, fine art skills, thumbnail sketches, and go through multiple iterations of concept art before you match the tone and feeling your art directors and animators are happy with.
Please take a look at our artist, Haisu Wang's concept design for his Avengers and Avatar. (More at https://www.artstation.com/haisuwang)