Even though I've listen to all your covers you've posted here when you first uploaded it, this is my first comment haha XD
I think it's kind of obvious that I am a fan of your high notes~ but I think you're getting really good with the low notes too. This is the first time I've listen to Rose T_T, anywais I think instead of giving you praises, even though you deserve lots :), I'll just share what I think you could work on. I think you held back a little on the emotion for the singing part. The rap/speaking part was perfect emotion-wise, so if you were able to bring that to the rest of the song it would have made it a whole lot better! And I think in general, lower songs are boring because it just sounds like everyday speech, so if you could over exaggerate the emotions, it could add some color to your voice :D. I do agree with Bigi about the power, but I think the way you sang it was you're own style and that didn't call for power. Hope to hear more from you Mich!! Keep improving! :)
Anywais I didn't comment on the other two because I had nothing constructive haha.
EDIT: Have you heard this song yet Mich? I think if you're going for emotional, you can totally pull this off :D Except for maybe the parts at the end? Prove me wrong :D! It's Gummy's Snow Flower song that's part of the OST for That Winter, The Wind Blows.http://www.youtube.com/watch?v=U5Ie5rS0DIQ