The streaks on the 2nd and 4th one distract me from the main image. Maybe place them a little more away from the Spartan? The other ones look very nice, especially the 1st one. Kudos!
I would have to agree with goathead on the streak things they were constantly distracting me from the spartan in the screenshots. I have always wondered how people add effects like that in there screenshots I guess I will find out how one day. Besides that great job with the screenshots they look great and I hope you can post more.