#1 and #3 are good shots and you don't need the vignette as there's nothing in the background to hide. And especially not the dark vignette. If anything, I'd try a light vignette in order to fade the "snow" to white.
#2 isn't a good shot to start with, and vignetting to mask out the other people won't help. Why not a good shot? Because you got his back... and without some great excuse (ie he was doing a flip, or blocking a shot, or was with someone who you got face on, or some such) it just looks like "I couldn't seem to get ahead of him, so this is what I ended up with".