There are a lot of professional portfolios on the ASLA resume posting page right now.
From my own observation they always seem to be pretty ‘gridded’ and straight forward–three or four drawings on 8.5×11 with a simple titleblock and project stats on each sheet. I’m curious what others suggest as well. Just my two cents.
If I were to re-do my portfolio right now I would probably have three professional projects and two or three student projects included. My little rule of thumb for myself right now would be that if you dont cringe when you look at it yet, then it’s still probably OK.