A) way too monotone, your missing the soul that Amy brought to this song, ur about halfway there. In my opinion I think you try too hard, don't sound too nasally and again don't try to mimic the voice... It makes it sound off key
This would be better if you didn't try to mimic Rihanna's tone of singing. Make the song your own. When you try to mimic the artist, your pitch will vary which results in you sounding offkey and alters your notes. Also don't focus on your face trying to "look good" - vocals are more important.
A) way too monotone, your missing the soul that Amy brought to this song, ur about halfway there. In my opinion I think you try too hard, don't sound too nasally and again don't try to mimic the voice... It makes it sound off key