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If you are actively seeking out employment, you'll need to show prospective employers who you are as an artist or designer. Having an online portfolio allows you to do just that. An employer can view a wide variety of your work, and determine whether you're the right candidate for the job.
Your showcase should be simple and to the point. Make your art the star of your online portfolio, and not hard to find. It should be your best work, so choose well. It is also quite helfpul if you keep your portfolio to one theme or style (or, create a separate page for each style), otherwise your prospective client might bcome confused about what it is that you do. You may be tempted to put into your portfolio all of the pieces you've ever created, but this will backfire, because a client probably won't look at the entire collection.
Image Credit: Courtesy of Sxc.hu/asifthebes