The amount of artworks you can upload will vary according to the Plan you have chosen.
Basic plan: You may upload more than 80 Artworks.
Advanced Plan: You may upload more than 500 Artworks
Premium Plan: You may upload over 2000 Artworks.
The artworks limit is lifetime, this means that you may upload up to the given amount of Artworks according to your plan. However, you can always delete some Artworks and replace them for new ones.
Please visit https://www.artplacer.com/pricing/ to see all available plans and features.