Free
Pixel Brushes
You can use them straight from the box, but I don't recommend to use any sizes with fractional numbers like 19.3 or similar to it, use whole numbers preferably like 42, 20 and etc. It still can work with fractions, but it depends on your choice.
This pack is free — download it straight from the author's page. All rights belong to the author; BrushCatalog links to the original source.
How to install: download the file, then in Clip Studio Paint, drag the .sut file onto the Sub Tool palette (or Sub Tool palette menu → Import Sub Tool). More details →
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