As for mastery, I believe that it doesn't really exist. There are some people who are better at what they do than others, but nobody is perfect at anything. Practice does not make perfect, it only makes you better, but not really to the point where you are the best. For example in art, there is no such thing as perfect. Pretty much anything could be considered art and anybody can create art. It is all about creating something you visualize; something unique. Something only you see. One of things that has always bothered me, but I know it must be done, is the fact that schools give out grades to students in art classes. I am not a big fan of that because there's no way a simple number can be put on your creativity. Art should be all about having the freedom of painting, drawing, or sculpting anything you like. It's about creating something you can call your own.
Passion. As far as passion goes, I am not sure what it is yet, but I know once I find out I will do my project based on that. That way I know I will be giving it my all if I'm really passionate about it.