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So pretty much I start out with a sketch in red, then add another layer and make the sketch transparent.
I then line the art in black on the new layer, then once finished, I go to effects and add 1 pixel of outline thickness.
I delete the sketch, add a new layer, then copy the line art down to the second new layer. I color on the second new layer (noting that it is below the other line art layer that remains unaffected by my coloring.
I add more vibrant or darker colors, depending on whether my original colors were vibrant or not, and just shade (similar to cel shading) in the places I would think should be shaded.
I start highlighting after that and add sparkles and stuff, then I add another layer (on the very top) and fill it with whatever color corresponds to the piq (in this case I used bright red), and then add a circle of white, and then blur it on the highest level about 5 times and make it 5-10% transparent. It adds light to the center of the piq and sort of a gradient around the edge.
It just looks nice, its not really necessary, neither are the highlights or shading.
HOPE THIS HELPED!! :)