Dom is right, you can't "work" on style, style comes from being comfortable on your scooter, and spending a lot of time riding your scooter. But trying to progress, as opposed to naturally progressing, is going to give you a much worse style, if you are constantly trying new tricks, and never perfecting the ones you have already learned, you will most likely have bad style, and your tricks will probably be sketchy. Its the difference between riding for fun, and trying new tricks when you are inspired to, and riding to be good, and trying new tricks, just to be able to claim them. Take your pick.