a few days ago, I registered my ArtistWebsites / FineartAmerica account, and uploaded about 100 images.
It's simple and straight-forward setup, however it seems that this community caters to more painters than photographers (both artists and buyers).
To satisfy your requirements, they have also provision for image specific comments (acerbic or others), but hardly as many comment readers/posters as in this establishment.
In general, I'm happy with the website, but I use also other sites/venues for different collections of images.
A useful feature at this website, when you log on, is a display of recent sales on the site, so it's interesting and sometimes inspirational to see what other artists are creating and selling.
If you want to try it (free for small collections, or $30 per year for unlimited galleries), here is my referral link
My initial gallery:http://www.les-palenik.artistwebsites.com/