Hi Christina, are you referring tot he Organization Logo? This is modified within Settings > Appearance of your Okta Admin portal. If this is in fact what you're referring to, yes-you can change it but it's also a globally applied image for all Users, we do not have a granular icon/logo option as of now.
Hi Grant, are you referring to the Sign-in Account Picture? If that's the case-no that's just a security image for sign-in familiarity. Now we do have a feature request to add a profile picture which is popular and I would definitely up-vote it here: