Do the kind of art that gets you excited about then work then it'll come across in the final product and if you stick with it, you will always improve. also, don't be afraid to shamelessly promote yourself and network either! People have to see your work before they can start loving it.
His great design:
The most important thing in those first 10 years out of school is not to take a job that will determine your entire life, which happens to alot of people. They start working for a magazine (any fields) and they start by assisting, and then become a junior art director (any fields) and up....and ten years later, they're married and have children. and then the option to change course has been reduce to almost NOTHING. SO YOU HAVE TO BE CAREFUL.