Concealer- if it’s liquid, fingers! my undereye concealer is liquid and i gently pat it with fingers (it’s a delicate area). the rest of my face i use one in a pot so you need a brush. I have a nice foundation brush that I use for concealer too.
it’s not by MAC but it looks like a larger version of this one:
195 - Face, Lip and Eye Brushes by MAC Cosmetics
Lip brush is standard - MAC just do 3 - a slim one, a covered one and a retractable one. the most versatile is the first.
Loose powder - you need a big brush. any of these, depends on your preference:
134 - Face, Lip and Eye Brushes by MAC Cosmetics
150 - Face, Lip and Eye Brushes by MAC Cosmetics
182 - Face, Lip and Eye Brushes by MAC Cosmetics
As far as face products, I’ve tried more than I care to remember. I do prefer MAC concealers always as they have so many shades and different types depending on what you want to use them for. As mentioned above, I have two for different uses.
Foundation is tricky you really have to get out there and test them. I yo-yo back and forth with different MAC ones and other brands.
Currently I’m on MAC Full Coverage [unfortunately it’s a PRO product so not widely available]. it seems very thick but if you apply it with a synthetic flat foundation brush and a very light layer, it gives fantastic but light coverage. When you’re going out for a special occasion, it’s really easy to build up the coverage too. unlike the other MAC foundations the colours are much better and not too yellow/orange. I only use it on my cheeks and chin and finish off the whole face with powder, yet it’s seamless.
Anyway, go out for some testing! Try and get some samples if you can.