The death of a young artist (under age 40, say, and Schiele died at 28) often gives thought as to how he might have evolved his work had he lived a full life. No certain answers, obviously, and I'm not about to speculate much about Schiele.
Simply by looking at the large number of works he created during his short career, it is clear that Schiele was obsessed with sex and the grotesque. A large proportion of his paintings and drawings are flat-out pornographic. How much of this was due to immaturity rather than a mental condition is hard to say a century after his time, but it's possible that he might have later moved in the direction of more socially acceptable subjects.
As for me, I think he had talent, though I find much of his work of little interest, unlike that of Gustav Klimt who kept serious porn to his sketchbooks while creating intriguing paintings.
Below are examples of Schiele's art that stray from his obsessions.