So. I review over 100 portfolios a year (in the past year the number is actually more like 500), either at GDC, online, or for job applications. Every GDC I take part in the "Killer Portfolio or Portfolio Killer?" panel and review session within the education summit, and run into some very common issues. Beyond the content inside the portfolio, there are many issues you can correct to optimize your review and make your work be as strong as possible.
I had posted this on Twitter, but wanted to share here as well. Here is the summary of those common issues I see in students portfolios on a regular basis: