Recently I've watched an interview with Mike Mignola (creator of Hellboy) who's a very interesting/particular guy.
What struck me the most with him was his response to a question about how an artist can develop his/her own styles.
His response was:
1. study a bunch of artist (see what makes their work so successful)
2. develop your own way to interpret that art work.
good advice :)
some of his work. Awesome right?!