Let people know where you’re from. This is always interesting to know, and some clients prefer to work with people nearby or in the same time zone.
Validation is important, especially for Web designers. If you’re going to be building professional websites for clients, then your own website’s code should at least be valid.
Link images, not just text. Most people will click on images, expecting them to point somewhere.
If you don’t have any previous clients for your portfolio, create a WordPress theme, design an icon set, develop a Twitter mashup, etc. You have a lot of possibilities, and there’s a big difference between having one project to show in your portfolio and having none.
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