im an artist, leeme help ya
draw shapes and lines frst
erase extra lines
as for shading push harder for shadows, but not too hard
use extra outlining in areas you cant distinguish
erase things you not happy with and correct them
smudge shading a bit with your finger if nessecsry
add black pen in dark areas
be carful to erase and dont smudge pen ink
add finishing touches like other lines and shadows below the drawing
the rest you can figgur out from there