SoWork is all about expression - a chance to be more than just a virtual video tile. And avatars are a great way to express yourself - pick your clothes, your hair, your shoes. You could make your avatar closely represent you or use your avatar to have fun - get green hair and a funky hat (because why not!).
You will be able to set up your avatar when you first enter SoWork. But you can always go back for a revamp - change it all up.