Limelight green has fine metallic in it, you can get a color differential just by using a different batch or spray gun or spray technique. As a general rule, if you want a slightly darker metallic color, apply the paint "wetter" by holding the gun closer or using a slower reducing solvent. Consequently, holding the gun farther away, using a smaller tip, or a faster evaporating reducer may make the color look lighter. If you are using paint from two different mixes on the nose vs the rest of the car, it is not uncommon for colors to look differently under different lights, or even "flop" as you go from one light source to another. This would be especially true if you used paint from two different manufacturers as they could have used different pigmentation to achieve relatively the same color. Highly doubtful that your painter applied too little as the coverage appears to be even and should have been sprayed to full hide anyway. Your solution is to spray some test panels with the white sealer and the SPI epoxy, then color coat them using different spray techniques and reducers as mentioned above until you get panels that match the rest of the car. Then sand down the nose and repaint. This way you wont have excessive film build on the nose and will help avoid problems later on from too much paint on a flexible substrate (peeling). If you are a novice at this, you may end up spraying a dozen or more test panels until you get the right shade.
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