I am not a UX designer, so in many ways I don't qualify to critique your portfolio Natalie, but I have some feedback that might be useful. Take it with a grain of salt.
First up, I love the way you clearly offer up the backstory along with the business problems that you were aiming to solve. You've absolutely nailed the issues that are raised in the article that Dean posted above. I feel like I have a solid understanding of why you chose to take the approaches that you did to solve the issues at hand. Nicely done.
I think your portfolio does a great job of communicating your skill set, education and experience, and shows how you are able to pull those things together and apply them to a project.
The range of different projects is great, as are the images showing your process, rather than just a finished product.
My only criticism is that it feels a bit like a school project. The design isn't quite as polished as I think I would be expecting as an employer. That possibly has something to do with viewing it as a pdf rather than as a website.
All in all I'm really impressed. I'm looking forward to hearing what the pros have to say about it.
Offtopic: As an aside, I used to love going to ScienceAlive! An old boyfriend of mine's dad used to be the CEO so I used to go there every time I visited Chch. Sadly, he was killed in the earthquake.