Do I have to create a mesh in order to use bone in an image? OR when should I attach the image to the bone and when is convinient to covert image to mesh in order to create a bone? Thanks

Hello guys, I am Joey, I graduated in Media Arts and Animation in Los Angeles, CA. Now I work in Chicago for a gaming company. Eventually I became Junior Game Designer but my animation skills need to improved on the Spine realm. lol Fun fact I came to the US to become a pediatrician but somehow I ended up becoming and animator.