One of Charlie's fondest hobbies is ink-sculpting.

Charlie's ink sacs produce an absolute deluge of ink on an active day and rather than wasting it all she likes to use it for good.

Unlike regular painting, ink-sculpting involves coating an object or creature in her ink and then remoulding it. Submerged in the absolute inky blackness of this liquid an object is absolutely everything and nothing at all at the same time, in the eyes of the artist. All Charlie needs to do is apply her creative will and sculpt to her heart's content.

This is a somewhat novel use of such a dangerous substance but she enjoys it, so why not.