Green Lantern 2011 could have been
First off to much cgi and second went from earth and bak to earth when they should have focus on planet Oa and get know characters better aswell the planet. Intro narrotor voice kinda spoiler movie story instead of audience explore it.
How Hal Jordan should have reacted of shock when he saw alien by the name Abin Sur like every human would if they saw unknown creature and yes the comics he was not shocked but this is live action so little diffrent.
What could done use some cgi instead of way too much cgi and use practical effects most part ad some cgi and other practical effects materials for exempel the characters snd built set.
Characters could been practical effects instead of cgi for exempel Guardians could played by short actors and actresses instead of using cgi on characters look like humans with blue skin color and missed opportunity for short actors actresses to get representation.
Castingen choice to Hal Jordan could have gone to Lessor known actor like Rick Malambri instead of Ryan Reynolds and same with Carol Ferris like Odette Yustman instead of Blake Lively.
Here list how they could have done the movie:
Use practical effects green lantern unifrom and could use lightning for cgi
Characters could been practical effects suit from either Jim Henson creature shop or Spectral Motion.
Follow source material from comics and 2009 cartoon movie.
Miniature and Matte Painting for planet Oa.
Stop motion for flying some scene and Claymation for raw power with slime crystal and plastic toys mixing with cgi.
Plan to how make this movie right.
For the Guardians characters could use short height actors and actresses.
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This movie could have been like early original Star Wars and Star Trek aswell also look at Dune how well that movie become.
Only thing I like Green Lantern 2011 was there accent for exempel Kilowog with american accent, Tomar-Re with australien accent, Abin Sur with new Zeeland and Sinestro with british accent and can only imagine that Brother Warth would of had an hindi accent if he appeared in Green Lantern 2011.
Kilowog
Should be practical effects suit and tall stunt kinda like 7 height also american accent. Make Kilowog like rough leader begin with Hal Jordan but later comes friends.
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Tomar-Re
Should practical effects suit and stunt or actor but could go with aussie accent.
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Guardians
Should play by short height actors and actresses also with make up effect.
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Ch'p
Should be practical effects like a hand puppet not cgi. Make him cool characters like Rocket Raccoon in marvel.