idina has a POP belt thought, which is completely different.
for a real belter, i would say think of ethel merman, yes, but don't be scared by her tone. belting can be not as...harsh (?) sounding as that. think of sarah jessica parker in "once upon a mattress" instead of ethel merman, i'd say. she's not the best known belter, but that's more the tone i think belting typically is.
you're fine with a really good mix.
"grace, you're stuffed in a box getting rid of ass plaque. let's face it, this evening is a bust."