I downloaded a really nice-looking custom brush pack for Procreate, but the results I'm getting look nothing like the previews. I've been tweaking the procreate brush settings for what feels like hours—adjusting the spacing, flow, and jitter—but it still feels off. Is there a systematic way to reverse-engineer how a brush is supposed to behave, or do you just develop a feel for it over time?
An orderly way is to isolate each knob on the brush and test its effect with simple strokes. Make a copy of the brush and set spacing to a known value then draw a dozen swatches. Do the same for flow jitter and size jitter. Compare what you see with the previews and keep notes on how each change shifts the result. This gives you a map of what each setting does rather than random fiddling.
I'm skeptical a single trick will unlock all the preview magic and that is okay. In practice test one factor at a time and judge if the stroke matches what you want. When in doubt pause and re check texture and tilt used in the preview.
Try one knob at a time and keep a small chart of what changes. If nothing else helps move on to another brush pack.
Consider the brush tip and texture settings as core drivers. Check if the brush uses a texture map or grain adjust the grain scale and intensity test tilt and rotation jitter and see how the preview aligns with actual strokes then replicate the same steps in a new file to avoid interference.
Another route is to compare the brush to a known good basic brush then note what is missing like heavier texture or softer falloff. Create a short experiment file and swap in pieces of the brush pack to see what effect each piece has.
If you want share the exact settings you are using and a sample stroke we can map a small experiment to align your results with the previews.