Kind of hard (read "impossible") to give you an exact recipe. Basically, the thinner your paints, the more layers you'll need but the smoother the transition between each one will be. As long as your mix is depositing color and not running everywhere (remember not to overload your brush, especially with highly dilute, and therefore extra runny, paint), you're doing alright. With sufficiently dilute paint and a healthy dose of patience, you can get amazingly smooth gradients with a single highlight color over a basecoat. Intermediary shades simply speed up the process.
I'd suggest starting on the thin side and dialing the mix back with additional paint if you don't like its properties or you want to reduce the number of layers necessary. Also, remember that you can always go back with highly dilute darker shades to soften overly stark transitions, should you lay any layers on too thick. Playing back and forth with light and dark can feel like extra work, but it really helps you get the transitions exactly where you want them. If you work fast enough, you may even be aided by a degree of wet-blending, even if that wasn't your initial plan of attack.
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