If you're a beginning or intermediate artist, reserve time for your actual work piece. Practice and training is good to build and strengthen your art foundation, but you also need to work on your actual work piece, something that could be part of your portfolio. Give yourself limited time or a deadline to finish your work piece, try hard to finish in time, this helps you to get used to working in a time frame (If you're going pro, you need to do this). Work piece is also great for gauging your progressive skill level and to figure out what you need to improve, be honest with yourself or you'll never get better. Try not to have unfinished work piece laying around, it's a really BAD habit. Happy drawings.