These thematic pictures of 颜色和形状 are analogous to a visual dictionary. The theme "颜色和形状" 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 chinese(Simplified) language, which is not your native language.
To expand your chinese(Simplified) language vocabulary on the "颜色和形状" topic, flashcards games are the best way: