Hay there @silver593
Im no vender, but id like to give my 2 cent if i may.
So the thing with using things like Art station, Deviant art and CGC Gallarie is that its a great way to get noticed and get your work out there, but for a port folio, you definantly want a custom domain name with a website.
Now you can use things like Weebly, SquareSpace or Wix. These are great tools to build your own system, and some have free options with great things for portfolios, blogs, and so on.
Now this could be fully over doing it, but its a good thing for any artist.
Hope this helps.