Ficus ingens, the Red Leaf Rock fig, is an African species that is not very commonly used for bonsai. I have been working with several plants and do not find them the easiest species for leaf size control, and proper density of branching.
Here is one before defoliation with old, tired leaves. The appearance is quite messy and disorganized
After defoliation the appearance is much neater and looks more refined.
The new leaves will be red for a week or two after they grow in, giving it its common name.