If I were a hero, I'd be Martin Luther (Part 2449)....

 Superhero Anydays

Don't know the artist, but it's great work, and it shows two guardians of Gotham City from Earth-2 in the 40s: Batman and Green Lantern. 

You can tell it's Earth-2 because this is a different Green Lantern than Earth-1's.  But also, Batman's not the same at Earth-1's: the chest icon, the purple gloves and of course, the gun. 

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And we also have a Power Man and Iron Fist cosplayer couple.

Power Man is a bit short and Iron First is a bit long and lean...although Power Man (Luke Cage) is quite attractive.

POLT