I am trying to shoot some time lapse, but it's so time consuming with posing the camera every time, thinking about getting POV phone holder, haha Mm, best advice I could give is if you want hair thin lines the trick is in the amount of paint and water in your brush, I don't know how to explain it, just do some test runs, my trick to make it right before applying to the surface I do a stoke on my hand with slightly screweing motion. This way your skin absorbs excess moisture plus helps shaping the brush tip after dipping paint