i think of Fi as a sort of ocean inside, with weather. its energy can be channeled into things, though usually trying to harness wild Fi storms into artistic expression does not work for me (i have an INFP friend who can definitely do this). but later, i can sort of "tap the well" and return to that state of feeling and utilize the knowledge of it for expression. elation, joy, contentment, mystery, sadness...
i've always drawn and painted, just because i have some ease of creating realistic images, and i've always played music because i grew up with musicians in the family, but i don't really associate the reason
why i do either of those things with Fi. i never started because of it. drawing, it was just fun to be able to replicate things i liked, or express my new ideas on paper; music was just because my parents enrolled me in lessons. now i think i add Fi to those things, but they didn't grow from that well. it's curious to me. some people have that "artistic soul" but i feel like really i just got lucky.
And I came to the, I suppose pretty obvious conclusion, that is because of the individual expression in whatever they do.
the ISFPs i know just have this really cool tangible sense of their selves. i figure you guys are the artists because Fi gives the strong sense of identity and individualism, and Se gives you facility with
media to be able to link yourselves back and forth to reality. perhaps if you tend to choose less conventional media, then it will be harder to see your arty side... sometimes i feel like i am more artistic in the way i dress than the way i paint! but you may still be transforming the things around you in a renewing, ever-changing, meaningful way.