Photos that don't appear in general searches

If your assets are in competitive categories, your images could be many pages down in the search results on the Buyer portal. Pay attention to how many assets are displayed for those keywords. If it's tens of thousands, it's going to be difficult to find yours.

Depending on the country where you live, some assets require additional vetting and are hidden from view.

If this is not the case, then it could very well be your title and keywords.

Are the assets you've submitted using the right keywords?
If the right keywords aren't used, they won't show up in searches.
When you change your keywords, the search database will instantly change to include them in your search.

If there are already a large number of assets registered with the same keywords, assets that have been sold in the past may show up at the top of the results.