Hokay, bit o' constructive criticism coming over:
Track 1, I loved your voice, it's so pleasant and lovely to listen to, but I think you went off-key a few times. Then again, it could've been because of the cold, so you're forgiven.
Track 2, I liked your choice of song, so pretty. Good voice, but I think you need to work on building a bit more strength and clarity in your upper register. Although it could've been an effect of a cold, I know I can't sing for shit in my head voice when I'm sick.
Track 3, methinks you should work on how you deliver the notes, because they often sound all slurred together and it makes the song sound like it drags on. Good entry though.
Track 4, don't hold back. It almost sounds like you're too shy to let your voice shine through. And it's a shame because your voice is way pretty, no use hiding it. Or is it the cold again? haha :P
I hope I upset no one, my aim was in no way to offend, but to help those who want to better themselves.
In conclusion, my vote goes to...
*drumroll*
Track 1