look at different art and look at what you like about that art then figure out how they do it and then apply it to your own work
then find out what your work is lacking and go find out how to make it better with the above process until you can make quality pieces of work
then continue making quality pieces of work until you have a concrete method of doing things <---- that will be your style

that is what your style is, dont try to develop it any other way becuase there is no other way

I Couldn't explain it better.