How to choose a template
Start from your work, not the style. If you have strong pictures, choose a template that gives them room. If your work is mostly written, like research or analysis, choose one built around type. If you have few projects so far, pick a simple layout where each one gets space.
Then test it with your own details. A template that looks great with a sample profile may not suit a very long name or a single project, and you can only find that out by trying it.
Personal, not generic
A personal portfolio should sound like you, whichever template you choose. The template handles the layout, and you can pick an accent colour. The words about your work are what make the page yours.