I can see what people are saying about the costume as well. In the scene especially where Hal makes the "quick change", it just looks a bit....off to me for some reason. I think the other stuff (Sinestro, Kilowog, Tomar, etc.) all seems to look pretty great, and I'm excited for the potential this movie could have. It is nice to see characters like this hitting the big screen. You always figure on stuff like Spidey, Batman, and Superman....but it is neat that we're getting to characters like Iron Man, Green Lantern, Thor, Cap, and hopefully others (Flash, etc.) down the road.
SHH has an index of screenshots from the trailer, which allows you to get a better look at many of those shots. Still really impressed with how they did Sinestro.