Try taking a pic of one in the sunlight. Can't beat natural lighting. I put several different light sources up if stuck inside, i feel that helps as well. I actually move my POV around the jigs until i see the most "sparkle" from the glitter then take the pic from THAT spot.
Man o' man - love those black jigs!!!!! The top green ones on the first pic would be killers too... but........ that black............. 2
Pup I think your pics look good. Like Attica said, natural sunlight is the best for taking pics. If you have a macro setting on your camera, that also helps when taking close-ups.