Is anyone's adobestock public profiles first images are most downloaded images / recently download i

As @daniellei4510  indicated, our portfolios are a mixture of previously sold and recently approved assets. I'm guessing that about half are among my top sellers, but half are also quite new and have few or no sales.

What @Nancy OShea said is also true. Most Buyers aren't coming to our portfolio pages to search for assets. They're using search words and filters on the Buyer portal. If a Buyer clicks on one of your images, and you happen to have similar assets in your portfolio, those will be displayed in the "More From This series" section below the asset. So there's really no need for Buyers to come to your Portfolio page.

Not necessarily. Looking at my own portfolio, I see a couple that sell, but the majority are those that were uploaded most recently. 

Customers rarely look at Contributor Profiles.  They use keyword searches & filters to find the assets they're looking for.