Given this paragraph about flashcards, is flashcard useful for learning painting?

A flashcard or flash card (also known as an index card) is a card bearing information on both sides, which is intended to be used as an aid in memorization. Each flashcard bears a question on one side and an answer on the other. Flashcards are often used to memorize vocabulary, historical dates, formulas or any subject matter that can be learned via a question-and-answer format. Flashcards can be virtual (part of a flashcard software), or physical.

No. Flashcards are useful for learning things based on memorization via a question-and-answer format. Painting is a creative activity. It's unlikely to be learned by memorization of existing materials. Therefore, flashcard won't be useful for learning