I have a two tier pricing structure system for brows, so a eyebrow tidy is done between 2-3 weeks and a eyebrow reshape is 3 weeks+. It's on my price-list, my website, no quibbles on timescale. Waxing or threading. The price is up to you. Every client is automatically booked for a reshape but if you know they're a regular or had it done exactly three weeks prior I honor it, however one day over I charge the reshape price. For me I charge fractionally lower for the tidy so i know i'm guaranteed that income plus i get clients re-booking more to keep the shape up.
In regards to adding on tint or defining them more using all the skills I charge a standard price. The above is just for the maintenance side of a client not requiring or needing a tint, just a brow wax or brow thread. I feel this is great for my clients that have aggressive hair growth and they don't feel out of pocket and can treat themselves more than having the odd one off hd brow treatment then come back 6 weeks later with bushy brows because they may feel that its expensive....this way you're still doing the treatment and managing the shape and getting regular income.
I went on amita patels masterclass earlier in the year and i put a post up about my experience with it. I would highly recommend. xoxo