Not the best for drawing

I bought this pen so that I can edit and smaller details in images (reflections or minor bugs hide), unfortunately, the pen has not done so well as expected, it can be anspitzen difficult, the red side smeared very light and the white does not get erased everything.

Alternatively, I have discovered the plasticine for me, he can vary in size, does not smudge and can be good and easy to work with.