I think actually I have some Vallejo and Andrea Prussian blue and they are not the same and I use one to highlight the other. Adding a bit of black for shadow is not bad, but white does not work so well for highlights as it makes the color pastel/grey. If you have access to an actual rack of paint to select your colors from, just take a look at other blue shades. You might check out French Blue and Insignia Blue.
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