The concealer brush would work great as a crease brush but Id rather use my fingers with my cream concealer :-( boo. The double ended eyeshadow brushes are awesome! Especially the blending brush. I take these with me when I travel-basically everything you need! This fan brush is okaaaaay- I tried to use it for contouring today but I may need something thinner and with more control so I might splurge and get the Nars Ita brush. The buffing brush I use to really buff in my powder on days that I feel like getting a flawless finish- I bet this would be awesome with a bb cream or foundation too. Overall, EcoTools is extremely affordable and awesome quality. I prefer over Real Techniques- srry x-(