The vocal should be the loudest element in the mix, but not so loud that it feels disconnected from the rest of the band. Use the pan knob to add separation between the toms, widen out the overhead mics, and add depth to the room mics. Learning how to balance all of the elements in a mix can be difficult, especially since tastes tend to change from genre to genre. As I mentioned earlier, louder sounds seem brighter in the top-end and fuller in the low-end which can trick you into making poor mixing decisions. You never know where your track will get played, and you want to make sure it sounds good in every format. Just drag and drop your reference tracks into the Wave Transport and listen to how loud the snare sounds in the context of the rest of the mix.