This is Sid, a nickname for Lizzie Siddal
I found her in a shop, so it was an appropriate name.
Gabriel and Sid are checking out some Goblin Fruit, as described in the book The Goblin Market, by Gabriel's sister Christina.
"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry, thirsty roots?"
Sid begs Gabriel.
"Could one bite really hurt?" wonders Gabriel.
"Oh, Gabriel! You always over-eat!"