I tend to use as big a brush as I can and one with a soft edge. I then dab it rather than wipe and progressively change down to a smaller brush as you get close to the bit you want to keep. (Probably left it a bit late on throat on my effort below but hopefully you get the idea). For an area like the bill you need to swop to a hard edge and the closer you zoom the more acurate you will be. Keep playing.
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Nigel
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