I don't do Ficus, so can't help you with that, but please do not follow the examples you posted.
The first picture: the plants are too young and thin to look like trees. It's just a collecion of young plants in a pot and does not look like a forest.
The second one: The plants are planted the same distance from eachother and the side of the pot, making it look very symmatrical, static, and very boring.
The way your plants are positioned is actually better. It looks more natural.