It is easier to find with big eyes. Those big eyes also help them watch out for enemies that would catch them. Because they have such big eyes, it is easier to get away. A dragonfly's eye is made up of many small eyes. Each tiny eye sees almost the same thing.
Most insects have the same kind of eye a dragonfly has.
That yellow liquid is the ladybug's way of protecting itself from its enemies. Put a little bit of it on your fingertip and sniff. It smells terrible, and tastes even worse. If an insect or bird tries to eat a ladybug once it will not try it the next time. So you can see that this liquid helps keep ladybugs alive.