I like the idea of sections ... because too many pics in one place can bore someone. Easier for the viewer and prospective client to find what they are interested in if you have it catergorized.
I think your online portfolio should be organized to suit the various types of work you want to get involved in ... as long a you have several images for each section ... perhaps at least 6, I would say. You can start with just 2 sections ... whatever makes sense for you and if you have enough great pics for each section.
For example, here's how I have mine organized: I do a lot of work for local designers .. catalog and ad work ... so I have a section called "Commercial and Lifestyle". I specialize in working with designers who have plus lines, so for me, it makes sense to have a "Plus Fashion" section. Then, to show my more editorial work (the fun stuff), I have a "Fashion and Editorial section " section. I try to limit each section to about 24 pics, but it depends on the pictures I have. I do try to show some stories ... with 2 or more pics from several shoots. (the link I have in my signature is not my pro site ... here's my pro site, so you can see what I mean about how I have it organized:
http://stylistbette.com/default2.asp )
A stylist would never have a beauty section ... but a photographer would, because it's a sepcialized type of shooting.
Don't think using more pictures in an online portfolio as an asset ... for a couple of reasons:
1. More just gets more cumbersome for the viewer. Especially if it's a busy client ... they will be reviewing many portfolios if they are considering stylists. The will get bogged down and quit looking. You want yours to stand out and to have the right kind of impact for your potential clients. And sheer numbers won't do this for you.
2. What will have impact is choosing the right photos. So, the most important thing to remember is to be ruthless about editing your pictures. You've seen me say this before, but it's sooo true ...
you are judged by your worst image, not your best.
So ... it's about only showing the very best and dumping the rest. And it's about the whole picture ... not just your styling. If the photo doesn't work because the model is not strong, or the makeup is off or the lighting is wrong .... don't put it in your portfolio ... even if the styling is great. Better to have fewer pics that are great than a whole bunch of them to show your versatility.