ok, i took some pics of my portfolios (now it's 1 of beauty and 1 of fashion+ body art).
it's just a simple book, i don't have any special cover but i guess you can make a cool cover on the computer, with a logo and a favorite picture..
i don't have any writings in it and i don't seperate the images. people don't look to deep in the portfolios. they go fast through them, and hope that something would catch their eyes, so don't put writings and seperations that aren't intresting to them.
make sure you have a veriaty of work, and things that are uniqe and people don't see every day.
20-30 i think is a good amount of pics. don't put to much couse no one would look all the way through a big portfolio, they'd usualy stop in the midle.
i hope now i've answered everything... :.)