Here’s how @bytonimuller fills in her brows:
“I begin by drawing a line following along the top of my brow line, beginning about 0.5cm in from the inside of my brow. I begin along the top because my brows (without lamination) naturally go downwards. I then use the brush to pull the colour through the hairs to even out the coverage. I then pull the hairs the correct way up and do the same along the bottom, however, beginning a little further in to the inner brow. Lastly, I hold the pencil at a diagonal and draw in a few vertical hairs on the inner brow and use the brush to ombré the top half to give a more natural, blended effect.”