Portfolio content for a tech artist?

Hi, I’m new here. I tripped across the site yesterday and thought I would join up. I’m currently trying to populate some new content into my portfolio to apply for an internship. What sort of things do hiring employers really want to see on a technical artist’s portfolio, or things that are a must-have?

I’m also looking for feedback to fine tune it before I try to apply. If you want to take a peek - send me a PM and I’ll send you the link.