One page per technique is not optional here. Powder brows, microblading, lip blush and eyeliner are four different searches with four different prices and four different expectations; a combined page surfaces for none of them.
The doubt searches bring the better clients in the long run. "Does it hurt", "how long does it last", "can it be removed": whoever answers those at length is found by people who are still thinking — and they later book with whoever took the question seriously.
Removal is a separate and badly served field. If you correct or lighten existing work, describe it on its own page: those clients are in a hurry, there is very little on offer, and they will travel.
Aftercare is worth a page of its own too. It's searched by people who have already had the treatment somewhere else, and it is one of the cheapest ways to be found by someone about to choose a clinic for their top-up.