A perfectly flat squeezed tube of toothpaste. I'm a neat-freak, what can I say?
BTW I think the last time I drew a tube of toothpaste I was an art student way-back-when.
BTW2 I think this will be the last time I add colour using coloured Staedtlar. I prefer either pen & ink or pen & watercolour.
BTW3 I'm using a uni pin fine line 0.1 and HATE it. The black is not very black and the nib is awful. I need to visit home and stock up on Staedtlar pigment liners, which are my favourite pens.