I recommend a nose shading brush.

I'm not very good at applying makeup, and my nose is flat, so nose contouring was really difficult for me at first. But after getting this brush, nose contouring became easy and comfortable!

I bought this at some makeup brush shop in Hongdae. I heard that a shop doing really well near Seohyeon Station opened a branch, so I went to check it out. I was convinced by the owner's sales pitch and bought it right away to try it out. The bristles are soft, and the angled shape fits perfectly where you apply shading. It made nose contouring so easy—you don't need any special skills; just adjusting the amount of shading powder makes it incredibly easy. Now, I can't go out without using it! Haha. Anyway, I really like it, so I'm recommending it!