Using the site: operator to limit results to those from a specific website doesn't always work when doing image searches.
See example search, for "site:wikimedia.org triage icon svg":
https://kagi.com/images?q=site%3Awikimedia.org+triage+icon+svg&r=no_region&sh=DZU846mWGOV2vyVnvMpU7Q
A number of results from other domains appear, like reddit.com, brandfetch.com etc.
(Interesting aside: with using the share link, different results were shown when I tested the shared link in a non-logged-in browser!)
Logged in:
Not logged in:
(Though this is besides the point of this post!)
When using site: operator, that only results from that site/domain are shown.