Sweet Dream Medley

I decided to cover the live version of Beyonce's Sweet Dream/Dangerously In Love/Sweet Love medley. I try to cover it precisely as her. However, I have had no formal vocal training. Just me trying to sound somewhat good. It's not the best nor am I the best vocalist I'm just trying to teach myself how to sing properly until I'm able to afford training. HOpefully this audio clip shows that I have a lot of potential to be a mainstream artist and your votes and comments will let me know that.