Feedback giving and receiving is really important, and I've found it can make someone's day to give them some feedback that helps appreciate the things they've done.
Something I've tried - and regularly failed - on doing is providing microfeedback (regular small pieces of feedback as and when folks do things)
However, Julia's point about asking first is something I've not considered before, so I'm definitely going to keep that in mind.
Recommended read: When your coworker does great work, tell their manager https://jvns.ca/blog/2020/07/14/when-your-coworker-does-great-work-tell-their-manager/
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