I’m mobile so can’t find the link, but the Portfolio handbook done a few years ago by some CMU students was great. Graphic design is still design. If your portfolio graphics sucks and you can’t work in 2D, why would I higher you to work in 3D? Form, color, pattern, detail, spacing and all the general rules apply in any number of dimensions. I may not expect you to have the experience and workflow of a graphic designer, but I’d hope you have the eye for good design.
/rant
Just seen enough terrible portfolios. Though I’ve maybe only seen 1-2 ever good ID portfolios with poor graphics, I’ve seen lots of poor ID with good graphics…
R