Your portfolio needs to reflect your target demographic, whether it is a couple looking for a wedding shoot, or an agency looking for a commercial shoot. If your portfolio gives off the wrong image, you wont attract any of the clients you want. Think of a wedding photographers portfolio, typically white, clean, and easy to use. This is suited towards the target demographic of a wedding photographer: typically younger couples sometimes females are in charge of certain decisions with dreams of the perfect wedding. Typically speaking, weddings are full of white, with beautiful flowers and rays of sunshine. If you want to attract wedding clients, you need your portfolio to resemble a wedding. At the same time though, if you primarily shoot fashion photography, chances are you shoot hip, trendy subjects and that is what your target demographic is looking for. Have your portfolio reflect that. It sounds too simple to over think, but youd be surprised what some people surround their best work in.