Reddit mentions of Show Case: Developing, Maintaining, and Presenting a Design-Tech Portfolio for Theatre and Allied Fields

This is a great resource for portfolios:
https://www.amazon.com/Show-Case-Developing-Maintaining-Design-Tech/dp/0240819268/ref=sr_1_1?ie=UTF8&qid=1478057461&sr=8-1&keywords=rafael+jaen

Some key things:

• Show your process. If you're including a set design for a show, you might have a small collage of some inspiration images, a thumbnail sketch, a final rendering, and a photo of the set.
  
  
• Keep it simple. Don't include 15 photos of the same set from a million different angles. Pick the best quality photo and make it big and bold. If you have a few looks, pick the photo that best represents the design and make that big and maybe include 3 more smaller images underneath.
  
  
• For college portfolios, if you don't have a lot of practical design experience, include examples of things that show your creativity and artistic or technical ability. This can be things like sketches, photography, graphic design, etc.
  If you're coming in person, don't be afraid to bring a physical item. When I had my final portfolio review in college, the strongest feedback I received was in regards to the fact that when I showed images of props I'd built for "Grease", I also pulled a fake root-beer float out of my bag and put in on the table.
  
  -Don't be afraid to go back and enhance your past work. If you designed a show in high school but didn't do a scenic design sketch at the time, go back and do one and include it. If you know how to do a scale drawing, make a simple scale plan for a scenic element that you built for a show.

http://www.amazon.com/Show-Case-Second-Edition-Maintaining/dp/0240819268/ref=pd_sim_b_1/176-7324097-3879356

This is a pretty awesome book and it pretty much covers all the standards on how to present your design work in portfolio form its quite good.