Hi!
If you want to see Indy artist portfolios, poke around the comcbookcollabs subreddit, digitalwebbing and deviant art (lots of examples around there). If you are looking for professional portfolios, just pick up a few comics and Google the artists. Everyone has a web portfolio these days. Lots of people use squarespace but it's a bit expensive.
Depending on what you want to do, you should curate your portfolio. Independent artists are expected to do it all (pencil, ink, color, sometimes letter). Professionals tend to do one step in the process. If you are going for a traditional professional job, fit your portfolio to the job you want. I.e. if you are trying to do inking, show examples of your inking (with a few of the pencil pages for reference). If you are applying for pencilling / general sequential stuff, show pencilled pages (with a few examples of the script you worked from.)
My website has a sequential section, but I don't do a lot of paid work... Yet! aaimiller.com. Not saying it's great, but it's an example.