Originally Posted by Tapejara

No, you can only change to the default avatars on the Vita - and PS4 too for some reason. If you want to switch to a premium avatar, it has to be from a PS3. But your avatar will change across PS3/Vita/4.

Yeah, I found this pretty strange. I was hoping you could universally change your premium avatar across any system. Maybe it'll be added in a future firmware update.