The criticism consists in denoting the good, the bad and suggest a solution in technical terms and sometimes subjective views. And is mostly applied on intermediate to advanced leveled works, because its the stage where the artist is getting into difficult areas that require of guidance. Abstract is in an advanced level of art, and the higher the level, the more difficult things become for the artist. That’s why criticism is necessary in such levels, so the artist can improve in the areas they acknowledge but struggle with. You won’t see criticism in beginners art because its the stage of learning everything, while higher levels consist in improving what has been learnt.
Nevertheless, it is also the decision of the artist to accept or reject criticism. So, what people suggested in this drawing is valid and suggested, not imposed. So, its all good! It now depends on the artist’s reply and opinion.