Esthetics Beauty mark

It's not a beauty mark, but I did a constellation tattoo on one of my dolls' shoulder, so also putting dots in strategic locations. Basically, I put on a couple layers of sealant, used a fine tip brush to dot on acrylic paint, and sealed again. If you want the beauty mark on the face, you could do it as part of the faceup; if the doll already has a faceup, it should already be sealed! So you might be able to get away with only doing the dot of paint and then sealing again to protect the beauty mark.

 

I do beauty marks often on my dolls as part of the faceup. If you wanted to do one that isn't permanent, maybe use a watercolor pencil (even getting a brush wet and dragging it along the pencil to use as "paint" if you'd like). That should wash off if you change your mind about it.

I'm not familiar with Gundam pens, but a quick google search came up that they're alcohol based. If you use that on an existing faceup, it will eat through the sealant. I learned that one the hard way!

 

Use a dot of acrylic paint on a toothpick. .