Rough Mask

I’m no sculpting savant, however, I do know the mask is not supposed to look like this. Problem is, I don’t know what’s going on or how to fix this issue. I have a suspicion the settings are the cause; I don’t normally use the other tools but if I had to take a guess they too have the same problem.

Here’s the file, if you need it.
Kat.blend (4.6 MB)

as you can see in the screenshot below, your faces are quite rough (hence your rough mask), and there’s not a subdivision surface to multiply your number of faces.

So add a Subdivision surface modifier, and you will see the difference