Praise be to Allah.
There is nothing wrong with drawing the eyebrows with a kohl pen, or dyeing them with a colour similar to the colour of the skin, based on the principle that things are permissible, as explained previously in the answer to question no. 103345 .
If some of the eyebrow hairs fall out unintentionally whilst doing that, there is no blame on you, because Allah, may He be exalted, says (interpretation of the meaning):
{Our Lord, do not impose blame upon us if we have forgotten or erred} [al-Baqarah 2:286]
{And there is no blame upon you for that in which you have erred but [only for] what your hearts intended. And ever is Allah Forgiving and Merciful} [al-Ahzaab 33:5].
And Allah knows best.
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