The BLF 338 All Over Crease Brush (medium) is a versatile brush that can be used for a variety of eye makeup techniques, including eye contouring, shading, and smudging. Here's a breakdown of how you can use this brush for each of these techniques:

Eye contouring: To contour your eyes using the BLF 338 brush, start by selecting a medium-toned eyeshadow and apply it to the crease of your eyelid. Using the brush, blend the eyeshadow back and forth in a windshield wiper motion, ensuring that the color is evenly distributed and blended seamlessly.

Shading: To create a shaded effect on your eyelid, use the BLF 338 brush to apply a darker shade of eyeshadow to the outer corner of your eye, working your way inwards. Use a light hand and build up the intensity of the color gradually to avoid harsh lines.

Smudging: To smudge out eyeliner or eyeshadow, dip the BLF 338 brush into a dark eyeshadow shade and apply it directly over the liner or shadow. Using small circular motions, smudge the color outwards and upwards for a sultry, smoky effect.

Remember to clean your brushes regularly to prevent bacteria buildup and ensure the longevity of your makeup tools/