Heeey, I don't know if this is A Thing Which Is Done, but damned if I didn't blarf a lot of time into arranging this thing, so I'm gonna share it.
These are the pages from my portfolio. We've seen a chunk of these things on dA, I'll scatter links to those below for the interested. Mostly there's some concept stuff in here I don't think we've seen.
In my limited experience sharing my work, for people planning to put together a portfolio, I'd considering including a slice of the sketch work and ideation behind pieces, if you've kept some around. It was one of the most frequent things professional art people said to me, how stoked they were to get to peek behind the scenes and into the guts of the machine. As it were.
Yes. I did do little BrainSpews for my opening and closing spreads. People got a kick out of them. (: