Drawing was a customary component of a standard gentlewoman's education in the late eighteenth century: cf. Mary Wollstonecraft's Vindication, Chapter 12. The oddity of its being here singled out as Elizabeth's concern is that it was not a component of Mary Shelley's Godwinian education. On the other hand, perhaps we are to understand that this is Victor speaking, not Mary Shelley. This, then, could be another aspect of the inherently sexist categorizing in which he engages.