I finally have a nail swatch of this polish to share with you. I confess it's still not great but I know it's as good as I'm likely to capture.
I think Dulce de Leche gives a beautiful pinky nude nail. I'm particularly enjoying it as I don't think the tip wear and minor chips show up as much as darker colours. Which is handy for when I'm trying to keep treatments on for as long as possible.
I have started using the Mavala system that I mentioned here. It's too soon to say if it has made any difference but I'm ever hopeful!