Ohhhh, I just love it when I write a scene and think it's good. For me, this is the test. When I return to a passage several different times throughout the day. I'll reread it slowly, savor each word, and each time, my heart melts. Oh, it doesn't get any better. Sigh.
So, what is it for you that makes you know, 'Yes, this will get 'em."