I know you said you were generalizing.... but JEEBUS -- talk to more artists.Here's what I think of each types in terms of creative/artistic expression:
The ST artist would express what the S function directly observes from either direct here-and-now experience or memory. As a Thinker, the ST artist will give more attention to form; making sure things are portrayed accurately or if things are in proper perspective and so forth. An ST artist is probably the most realistic artist.
The SF artist would also express what the S function directly observes or for the Sensate emotional rush of doing it, which is directly associated with SF. But as a Feeler, there is more likely to be a personal meaning. Sensing combined with Feeling is inclined to see beauty, which is both concrete and subjective. An SF artist may also be inclined to do abstract expressionism, because there really isn't a conceptualized notion beforehand, but it's a direct expression of the abstract world of feelings, which the SF artist will most certainly find meaning. Art would probably be more impressionistic or expressionistic.
An NT artist would express the N function's mental conceptions, but the T function would not really worry about how it will make people feel. Their attention isn't on the human condition, but more on systems. NT artists are probably least concerned with aesthetics and more concerned with just expressing a brief piece of their complex mental constructs. More attention is given to objective vision. Art will probably tend toward surrealistic and fantasy.
An NF artist would express the N function's mental conceptions, but the F function will consider what their conceptions will mean in human terms. An NF combination will express an imaginative conception but when coupled with the F function, will also wish to make a statement and express an underlying meaning. Art will probably tend toward symbolism or surrealism interlaced with symbolic meaning.
All of these are generalizations, of course, but I was just pointing out that focusing on meaning is probably more related to Judgment functions.