These thematic pictures of மக்கள் are analogous to a visual dictionary. The theme "மக்கள்" 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 tamil language, which is not your native language.
To expand your tamil language vocabulary on the "மக்கள்" topic, flashcards games are the best way: