leeneia, lifting your cheek bones means consciously lifting the muscles that cover them, which may brin gthe upper part of the jaw up a bit. Smile and notice how your cheeks lift, then try and do the same lifting without the smile. It will brighten your tone considerably. Also if you're singing with a music folder in a choir you can shift the angle of the folder a little, lifting it higher and it will reflect a little of your voice back towards you so you can hear yourself.