I think the second photo is more successful then the first one because the added colors really add to the pallet you've chosen while in the first one the neutral cloudy look doesn't seem to fit that image. The grayness around the edges could work too if the opacity lower, it feels too obviously placed over the photo with how thick it is around the edges. Just play around with it some more and I think you'll have it down pat
I think the white dots would make a better sparkle image if they weren't so bright. When they are bright in the darker areas it draws your eyes to them. I wouldn't mind it so much if the dots in the light were brighter than the dots in the shadows, I think it would give it more depth.
I think the cropping you did of the photos is really nicely done and it is flattering for the characters and the cosplayers shown.
Overall I like both the photos and I'd love to have either of the images if I was the cosplayer in them, they are both really nice. Keep it up