Hi Julie, I've been painting with acrylics for a few years and I've found a couple of ways to make things "glow". I use interference paints....here's a description of what they do:
Iridescent, pearlescent, interference, and metallic acrylics combine conventional pigments with powdered mica (aluminum silicate) or powdered bronze to achieve complex effects. Colors have shimmering or reflective characteristics, depending on the coarseness or fineness of the powder. Iridescent colors are used in both fine arts and crafts (this is from Dick Blick).
I've also used a combination of acrylic gel mixed with a tiny bit of liquid acrylic colour (so it remains transparent) and gold pigment. The effect was really rich and had lots of depth.
Hopefully this'll still get to you even tho it's a few months late!
cheers
maggie_stg