These thematic pictures of رنگ ها are analogous to a visual dictionary. The theme "رنگ ها" splits into several parts. For children, especially toddlers from 1 to 5 years old, it is better to divide the sets of cards over several days, or even weeks, so the information is absorbed better. Especially it is true if you are using flashcards to learn the farsi language, which is not your native language.
To expand your farsi language vocabulary on the "رنگ ها" topic, flashcards games are the best way: