I've not found a technique I like for really curly hair. Wavy to mildly curly I feel good about. Do you have a technique you like you would suggest I consider?
For the record this is the best I've done and I'm happier with it than any other attempt. But it's not a good as what's in my mind or the reference.
The reference for reference: 
Timelapse: https://bsky.app/profile/ballshapedman.bsky.social/post/3mp2qtpukqs2c
Have my rambling thoughts!
Buying a brush pack is helpful in this circumstance unless you’re wanting to figure out how to do it yourself.
If you’re intent to use the same brush for everything then I would practice tracing over coiled hair to get a sense of how to move your brush. It also helps to watch videos of people with this hair type to see how the hair density changes with the lighting- at some angles it can actually look quite sparse compared to what you might expect in your minds eye.
I like to pull the small springs out of broken pens/mechanical pencils and take a bunch of pictures of them stretched out/bent at various angles since it kinda helps my brain focus on the shape by itself rather than being overwhelmed by HAIR.
You also don’t have to detail every single hair coil either- it’s most noticeable around the edges of the hair, framing the face, and wherever the light is brightest. It’s kind of like texturing trees or grass in that way.
Tbh what you have now looks like a good “base” that just needs more detailing. Could use a smaller brush to do a few highlight strokes or wisps of hair sticking out here and there. Some thicker parts could be faded into the skin colour more around the face.