Style, if there is such a thing, develops over time. Each artist is an individual and in the course of a lifelong practice natural propensities begin to emerge regardless of the material, subject matter or techniques deployed. No matter what they do, if artists are earnest, thoughtful, and true to themselves, the art that results will always look and feel like their work. The look and feel of an artists work can be called their Style. Developing a style takes a while, and is very personal.
Young artists often think that they should develop a style and, once established, they should not deviate from that style. This is a somewhat antiquated notion. In the post-postmodernism era, anything goes. Artists are free to use any material, subject matter, and technique they want. Artists are free to change all of that at any time.
Style is not a preconceived thing. The artist doesn’t sit down one day, perhaps at the beginning of freshman year of college and decide “this is going to be my style!” and commit to it for life. On the contrary, as artists continue to make and research their art, and to learn skills and experience life, the look and feel of their art becomes more discernably their own. Eventually, art made from any material, technique or subject matter will yield results unique to that artist.