This Pen Is perfect for blush on kawaii Characters and for blush colored lines
The Squid on the left has this pen used as blush and on the squid on the right it is used for the whole squid, but because this brush has a fixed color I used different blending modes to get a monochromatic squid but you could always change the color by using a layer mask or converting the drawing,

I hope you like this brush,
KawaiiSquid
Category 1