When you upload a new artwork, it immediately will be shown in New Art under the 'Sort by' then feed filter.
To see this, go to New Art. Then click '+More'; new filter option should show up called 'Sort By' click on this and then select 'Feed'. Have a look at the GIF below!
The 'Feed' tab acts like a live feed and displays all artworks in order of most recently published.
The 'New Art' tab is generated via a trending algorithm. This algorithm combines a changing mixture of artwork clicks, shares, links, favourites and human curation.