I think the best route to this really depends on what content you want to be on the site, and how much you're willing to dig in to learning a website management system.
Artstation and others are great if all you really need is a basic portfolio with your images (which you can add descriptions to, etc.). And they help you get visibility and comments due to the communities there. A stand-alone website of your own doesn't have the community advantage, though it is a lot more customizable on the flip side.
Wordpress is good if you want a more fully customized website and have time and energy to pick out a theme and understand how it all works. If you've never dealt with web hosting or a website management/content system, it may take a while to get up to speed.
Platforms like Wix, Weebly, and Squarespace are arguably easier, more drag-and-drop (although there are drag-and-drop page builders for Wordpress too), but they are not necessarily free. Wix and Weebly have free versions, in some cases with ad support, so I'd recommend paying for them. But I'm not sure if you have budget for that.
The nice thing is you will need some kind of hosting for even a Wordpress site, and for the most part that in itself will cost money, so paying for e.g. Weebly or Squarespace gets you all-in-one, a hosting service *and* visual website builder/editor. That would generally be my recommendation.
- Oshyan