Aww tysm and happy you liked it!
Since I get this question a lot, it might be worth leaving this answer here for anyone else who is curious: I just use variations of a hard round brush, with pressured opacity on or off! Nothing special. Sometimes I will swab a big random texture brush (my faves are CSP's default Gouache or Thick Oil Paint) just to get down some variation in the beginning or in backgrounds, but very little.