For Photoshop:
Open Photoshop. Double-click on the .abr file to install your brushes. This will automatically add these brushes to your preset menu.
For Paint.net:
You need CustomBrushMini Plugin: here
For GIMP:
Enjoy!
Custom Content used:
- Skin: https://ddarkstonee.tumblr.com/post/181477946743/ddarkstonee-ddarkstonee-a-s-i-a-n-s-e-t-b
- Hair: https://simpliciaty.blogspot.com/2018/11/thea-hair.html
- Eyes: https://www.thesimsresource.com/downloads/details/category/sims4-eyecolors/title/exogenous-eyes/id/1435704/
- Eyebrows: https://www.thesimsresource.com/downloads/details/category/sims4-hair-facial/title/eyebrows-09-eliza/id/1418658/
- Lips: https://ddarkstonee.tumblr.com/post/178247470548/lips-n12-hq-compatible-32-swatches-all-ages
- Earrings: https://l-ts4mm-l.tumblr.com/post/165594667563/isjao-kiss-kiss-boo-earing-by-jao-bgc