how many different types of pencils do you use?
For the two bottom drawings that's just straight pencil, 2B is my favorite kind of pencil if I could only use one and I use it for sketching.

In order:
4B Pencil used for sketching
HB 2 pencil for sketching and also I sometimes use the eraser on the back since it's nice and narrow and attached on the back of the pencil, otherwise I use a standard type drawing eraser.
Various size of blending sticks that I use with charcoal for when I need to be precise, I also use my fingers on broader/softer areas.
Soft charcoal pencil, used for especially dark areas/hard edged charcoal details (eyelashes, wrinkles, hair, etc.)
I don't know the name of this type of charcoal, but it's light and blends really easily, I use it for light areas/very basic shading.
Block of soft pressed charcoal used for really dark/really broad areas of shading. I've only used it for backgrounds, really.