I don't care for the official Rainbow Power designs, but I think they can look good with a bit of artistic license and toning-it-down. Spike's included because I needed someone to fill Twilight's color in the rainbow.
I tried to gain more experience with Illustrator's Gradient Mesh tool on Twilight. This allows you to make complex color gradations — such as highlights and shadows — on an object to convey depth and shape more realistically than a linear or radial gradient can achieve.
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