While there are many drawbacks in IMVU, such as you cannot give away your products as freebies, there are some advantages, such as being able to use trademarked and copyrighted works.
There never seems to be an issue with it. I have been able to make an Anna from Frozen avatar, and an Elsa as a child avatar. They look amazing, and they are unlike anything you see in second life.
You can also try on any outfit before buying it, without the need to buy a demo, you can try them on with a click.
These are three characters I made for myself.