/ic/ - Artwork/Critique

Hello fellow CSP victims
I just started the Ctrl+Paint guide on rendering and digital painting. Throughout all his guides he uses photoshop and provides brush presets and resources for it when needed. I prefer to use CSP, as Ive been using it for years and am more comfortable with its interface. Plus it might just be me but it always feels like PS is just waiting to fuck up in some catastrophic way and ruin my day
Anyway I was trying to replicate the brush presets provided for photoshop but I couldnt figure out how to get a brush to maintain a consistent opacity when certian pressure is applied like in pic related.
TL:DR I need to replicate pic related in CSP and havent a clue how. I know absolute jack shit about making brushes so sorry if this is a brainlet question but I just really fucking hate photoshop