I have tried using blood magic.
That sounds dangerous! What kind of magic was it?
I used my own blood to create images.
You're hurting yourself in the name of blood magic. There is no such thing so you better avoid it for your own good.
I don't see how it could hurt me. It's my blood, who cares if I use it or not.
It could hurt you because if you accidentally cause yourself to bleed too much, you could get in serious trouble. You could quickly get lightheaded or pass out if you bleed too much. You need to stop this practice so you don't severely injure yourself.