At 5 weeks after an uncomplicated breast augmentation, permanent eyebrow makeup is usually not directly harmful to the breast surgery because it is on a separate area. The main concerns are overall healing, infection risk, and whether you are still taking antibiotics, blood thinners, or medications that could affect healing or bruising. I would only do it if your breast incisions are fully closed, there is no redness, drainage, fever, or wound concern, and your surgeon has cleared you for normal activities. Choose a licensed provider with strict sterile technique and avoid the procedure if you have any active skin infection or if your surgeon has specific restrictions. If there were any complications with the augmentation, it would be better to wait until your surgeon confirms everything is stable.