In the same way scripts are constantly reworked and rewritten throughout production, movie concept artists have to redraft the faces of our beloved characters until they fit perfectly with the characters we imagine. Once a film is released it's so difficult to picture these onscreen legends appearing in any other way as their entire aesthetic is such a huge part of the personalities we have come to know and love.
In the images in this list, Star Wars' Yoda looks more like an average garden gnome and Shrek, rather than a charmingly clumsy ogre, is more an ill member of the Coneheads clan.
Take a look at the early concept art below and see if you can imagine these well known movie personalities in their nascent form.
Emma Frost - X-Men: First Class
Yoda - Star Wars
Shrek - Shrek
The Mad Hatter - Alice in Wonderland
Hopper - A Bug's Life
The Caterpillar - Alice in Wonderland
Spider-Man - The Amazing Spider-Man
Neytiri - Avatar
Beast - X-Men: First Class
The Kraken - Clash of the Titans
Bane - The Dark Knight Rises
Chewbacca - Star Wars
Jabba the Hutt - Star Wars
Silver Surfer - Fantastic Four: Rise of the Silver Surfer
Azazel - X-Men: First Class
Buzz Lightyear - Toy Story
(Source: Screen Crush)