erasing? inconsistent pressure? drawing stuff in multiple strokes?
not sure how to describe
he's using multiple lines for each stroke

like that would be a single, thick line
but if you traced over it then you would just do two lines for the sides of the thick line
im not sure if this is easy to understand
also the artstyle is completely different from the last time he posted
plus, the both images are hosted on instagram
reverse image searching the first drawing brings us to
Kilo_Artsbut going through Kilo's instagram page doesn't show the second drawing at all