I am developer, but I am trying to build my portfolio now that I am out of work. Take my advices with a grain of salt, as I said I am not a designer.
- Include links to the live version of the sites that you had design. You are selling design + xhtml, so show your html in the wild.
- The design background is very similar to other in themeforest, I like it, but for me is a bad point if you are a designer.
- The website dont need to look exactly the same in every browser, but need to look good in any browser. Check how your website display in iphones, androids, etc. Use css3 media queries.
- In the contact information, provide a phone number, or at least an skype contact. Some customers feels better talking to you on the phone. Maybe a twitter and other social networks.
- If you use flickr or other apps use them to promote your work.
- Describe your service in a tagline, or at least in the front page.
- in about, let the costumers know more about you guys, people like to know who are they doing business with. Answer this questions
- Who is this person?
- Are they trustworthy and reliable?
- Are they looking for work?
- What technology are they experts in?
- As wdewind said above, show only your best works.
- use the last jquery version.
- Dont style the page using the inline style attribyte in the nodes. replace them with with external CSS definitions.