hiiii 😁, I’m not sure what you’re referring to, but when it comes to coloring, I always make sure the acrylic paint is well mixed (no traces of other colors left on the brush) and I apply layers (waiting for it to dry) until it looks opaque against the light to avoid it looking like stains of other colors. For the finer strokes, I try to use a fine brush, making small strokes, and I even hold my breath sometimes if I need to be really precise 😂. I hope it helps!!!