Try not to compare your children, even if you think you are skillful at it. You may say most positively that "Susan is pretty and Sandra is bright," but all Susan will remember is that she isn't bright and Sandra that she isn't pretty. Praise each child individually for what that child is and help him or her escape our culture's obsession with comparing, competing, and never feeling we are "enough.
The one radio voice that I listened to above others belonged to Ella Fitzgerald. There was a quality to her voice that fascinated me, and I'd sing along with her, trying to catch the subtle ways she shaded her voice, the casual yet clean way she sang the words.