Superhero logo icon set

Starting a new side project. I'm creating a set of superhero logo icons. This is the first batch in the series. More to come. I'll upload the final file for sharing when I'm done. The ones seen here are:
Top Row: Superman (first appearance, silver age, Kingdom Come)
Middle Row: Batman (first appearance, silver age, current)
Bottom Row: Green Lantern (first appearance, silver age, Kyle Rayner version)