You comb the eyebrow hair (for example with a clean, dry mascara roller or eyebrow comb) in a downward direction and fill in the upper edge. Use an MS2 or MS4 brush for this (with obliquely cut hairs) Hint: you can also use a brush (for instance R4 or M4) of which you yourself have cut the hairs diagonally.
Work from the centre to the outer areas and do not begin right where it starts.
Then you push the hairs upwards and fill in the eyebrow a little from the bottom.
