I'm making a utility where users rate images from favorite to least favorite.
In the creation flow, the user must add at least two images, and is given the option to provide a title or description. There is a button for adding images. As images are added they are shown in a grid.
This is how it currently looks like when you have not added any images:
Once you've added images it looks like this:
You can continue adding images, at which point it starts to look like this:
I'm unsure of how to communicate to the user that they have not yet added the minimum number of images required to continue. When the user image count is below the required number, the save button is disabled. I believe this makes it clear that they're missing something, but I'm not sure how to make it clear what exactly it is that they are missing.