These thematic pictures of 颜色 ngaan4 sik1 are analogous to a visual dictionary. The theme "颜色 ngaan4 sik1" 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 cantonese(Colloquial) language, which is not your native language.
To expand your cantonese(Colloquial) language vocabulary on the "颜色 ngaan4 sik1" topic, flashcards games are the best way: