I just browsed your site for 5 minutes, and here are my initial impressions.
First, I thought, "what a great idea", and wanted to read more about the benefits.
I was pleasantly surprised to see that you have a database of portfolios to look at, but any that I clicked on just provided a name, phone, and email address. Sometimes a website.
So my next impression was, why would an individual opt to post their portfolio on your site, if they can just do it themselves on a picture posting website? The only reason that I can come up with is because companies that hire would be more likely to find a candidate's portfolio on your site. Still, I wonder how recruiters find you.
After a few minutes of going through the fee schedule on your site, I'm still not sure if a person can post a portfoilo for free, or what the charge is. There seems to be some conflicting info there. I'm sure if I spent more time reading through your site, I'd get a definitive answer to this, but I feel it should be more clear at the outset, since people are only willing to devote x amount of time to a new site. Things should be VERY clear, to keep one's interest, and inspire them to join.
I still think it's a great idea, and I deliberately gave it only a few minutes of my time, because I do believe that a person will be sold (or not sold, as the case may be) within a couple of minutes of perusing your site.