Have you tried handmade watercolors? Some of them have these really cool color shifts and perfect for a night sky.

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>> SUPPLIES <<

Trinity Stamps – A7 Spring Birch Die
—TS: https://shrsl.com/3htef
—SSS: https://shrsl.com/3hteg
—EH: https://bit.ly/3xWFdF9
—Scom: https://shrsl.com/3htei
Trinity Stamps – Simply Sentimental: Thanks
—TS: https://shrsl.com/3g3qd
—SSS: https://shrsl.com/3g3qh
—EH: https://bit.ly/36Ux2xF
Hydracolour – Winter Frost Sample Set : Shimmery Sparkle Handmade Watercolor Sample Card
—TS: https://shrsl.com/3htej