Dr. Ryan Niemiec from VIA Institute on Character created the SEA model for strengths spotting:

S – Spot/label the strength
E – Explain by giving a short rationale of the behavior you observed
A – Appreciate or recognize the value of the person for their strengths use

You can learn more here:

https://www.viacharacter.org/topics/articles/10-ways-to-celebrate-strengths-in-the-workplace