These are done using a colorant core with a clear/silver sparkle plastic, adding eyes, then getting hand brushed with a combination of hi lite/pearl powders and cover dipped.
The top and third bait down are brushed with Jacquard pearling powders. The second and 4th baits are done using automotive paint pearls designed to be used as shadow hi lite in clear top coats on custom paint jobs for cars/trucks.
The single bait picture is a larger bait using the same processes.
The more solid colored bait is done by using a larger brush and more of the pigment and too is the larger sized bait.