The Latest wall on ArtStation takes > 5 minutes to update. After posting, you should wait at least 5 minutes.
When checking, you should do a Force Refresh, as your browser may be caching the page:
- Windows: ctrl + F5
- Mac/Apple: Command + R
- Linux: F5
Your works will definitely appear on Latest.
Unless you have set the visibility of the project to not appear on ArtStation.com, your works will definitely appear on Latest.
When I update my artwork, does it appear at the top of latest?
No. Because if it does, everyone would try to update their works to get more visibility and abuse the system.