To get it to show up the best, i would suggest doing it as two separate paint applications. Paint the Pearl coat on first, slightly re-heat the head, then add on the silver holographic glitter second. Don't have to completely smooth over the Pearl if you re-heat it between paints...... personally think it is more durable in the long run if you keep the base coat kind of rough and bumpy between coats, but that may just be me. It will all smooth over during cure. Just be careful not to heat too much or a lot of paint will stick and end up slipping and sliding on the head while curing.
You can either get the pre-mixed stuff (glitter mixed with clear powder) from ProTech/CSI or you can make your own by adding hobby store glitter to any clear powder paint.
In my experience, would not try to just mix glitter in with your Pearl powder and hope to get it done in a single dip. The Pearl paint will cover up most of the glitter. It can be done by thinning out your Pearl by adding clear to it, but you will loose some of the dense color of the Pearl.