Hi Satoshi,
Thanks for the post.
I rate the singing a 5. Don't be disappointed because this isn't bad rating, except that it is a rating that will not get the listeners to want to come back to listen over & over again - because it is SHIOK to listen to.
If you think of vocal is an instrument just like any other musical instrument - try listening to say, your favourite drummer. Why don't you get bored listening to this drummer? Or a good guitarist, why is he/she good to you?
A good instrumentalist, including your very personal instrument - the vocal cord, when it is well played, each and every sound coming out of it is a pleasure to listen to. You have to strive to achieve that.
Practicing live with a good accompaniment while you concentrate on delivering that objective will probably help.
Remember - EACH & EVERY sound coming out of your vocal cord must be satisfactory to you.
Hope this helps - my 2 cents...
Regards,
IdaRap