there should be a preview avatar option
so you can preview your avatarimage in the profile, before you finally change your profile with the new avatar
You can already. If you choose any from a preloaded set it does.
If you are going to upload it from your PC you already know what it looks like.
previwe could be useful.
e.g. if you can't hotlink your avatar image from another website. Then you can directly see this in the preview