How to create a glitter gold effect with colored pencil
The phrase my first painting teacher used the most was "Contrast in Value-!" The best way to make anything look realistic is to pay attention to the lights and darks, or "value" of the colours. I recommend unfocusing your eyes to take in the general sense of contrast- how much of that "glitter" really stands out? Can you convey what you want without it?

I think the key thing would be leaving areas bright white to imply the reflected light. How far along is the drawing? Assuming your paper is white, you could draw teeny tiny circles for the glittery flecks, but only fill in your colour around them so they stay white and look "shiny."