Oddly, I can't find the Leila Kalomi image on TrekCore's screencaps, either DVD or HD. But it's definitely from "This Side of Paradise," unless Jill Ireland used that exact same hairstyle in some other show. Maybe it's from a publicity photo. But I have no luck finding it with an image search for "Leila Kalomi."
And I kind of get a third-season vibe from the TCoK Spock image, though I can't say why.