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Above is one of the 4 jet packs worn in RoTJ. 2 were exploding jet packs, 1 a stunt jetpack (foam I believe). This is the one that your jet paint job should be modeled after
Notice the difference in colors on the top and bottom of the tubes versus your jet pack. It should be the same color as the bottom of your rocket and thruster. Also notice the difference in weathering on the center blue area versus your jet pack.
For reference purposes here are the other jet packs used during the filming of RoTJ.
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Stunt
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Exploding 1
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Exploding 2
As a super awesome realism factor, the decals at the bottom near the center blue stripe (on the white area) in the main jet pack used were very faded...almost blue in color.