Hi! I use procreate on an ipad mini, and go through a lot of brushes but usually come back to the same bunch:
- Sketch round or clean sketch for sketching from Jingsketch's basics
- Fading edge or Stratmore 3.0 for lineart from Georgvw in the occasions I try to do clean lineart 😅
- For colour I love Tarraleah, which is default procreate, Tilt Marker and MD watercolor craze from Paperlike, and one called akwarela true that I can't find the origin of right now but I think came with a pack Dorn had in their patreon
- For light I use the default procreate luminance brushes, and the default spray paint flicks brush for freckles
- For texture Dusty Shader and Seamless paper, also from Paperlike

These are the ones I keep coming back to, they were all free at the point when I got them 😊