Hard to tell for sure from the tiny picture. Two choices would be the lemon peel or heraldi. There don’t seem to be blue edges to the fins and eye that I can see, so I’m leaning heraldi.
I have kept a peel many times. They are an awesome fish, though among the most destructive of the dwarfs with hard corals/SPS (although the one I have now was actually OK - kept it well fed). Fine with softies. They can also be difficult to acclimate and get eating. Perhaps not a beginner fish. Never kept the heraldi.