one of the best investments..MAC 187 aka stippling/duo-fiber brush! You can't go wrong ith this one..best for powder, cream/liquid foundation, blushes, highlighter, loose powder and the likes....
I have some Trish McEvoy brushes, Is the eyeliner brush the one that you wet the eyeliner and press with edges of the brush across the eyelid. I have trouble with the technique.