I use 10 to 11 brushes daily. To choose 3... hmm...
208 for eyebrows - I would be lost without it since I'm a brunette with blond eyebrows... yeah, it looks really wierd on me
224 for ES blending - my worst fear in being "unblended" LOL
231 for upper lashline lining/winging - a M.A.C. MUA recommended this brush and showed me how to use to to do perfect upper lashline lining and winging - he even drew me a diagram and took the time to stand behind me and guide my hands in the mirror - he is a GOD