Looks good. Nice detailed BG, good lighting. four good superhero stereotypes- just what you want for a game. One reasonable thug- type- again, just right for the game balanced pic. No problems.
So how are you getting on with the game? I assume you mean FoJ when you wrote FoT !
You may have to do more for Newgrounds before most people will come on board. So many newbies are full of dreams and can't finish anything- you have at least finished and submitted a good pic. Since you can do art to this level, I suggest you put together a couple more pix relevant to the game, both to give us ideas of what you have in mind and to prove your commitment to the project. If you got scouted, you would be established as an artist here, which would motivate people to support your project.