She isn't "way too skinny" because the illustration fits the description of the character as given in the book. Because of that, said illustration is objectively well done.
The personal, subjective, preference in regards of appearance i.e. If the reader thinks skinny or chubby or something in between looks better is a completely different topic.
Again and again, ad nauseam: De gustibus et coloribus non est disputandum.
As a matter of fact she is too skinny for Ivans tastes too.
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