I don't know why I can draw and paint. It's just something I have been able to do since an early age. I suppose I am lucky to have a gift that has enabled me to earn a living doing something I enjoy.
It has taken a lifetime to cultivate that gift into a skill, developing techniques and learning technology to enhance and broaden my reportoire of styles. Not that I have an actual methodology to the way I work. I just do it really.
In reality, anything is a blank canvas to me. If it stays still for long enough, I can draw or paint on it. Whatever you want.