This post describes steps you can take to change your account profile picture in Ubuntu Linux.
Ubuntu Linux allows users to add, change and remove picture from their account. Photos you add to your profile are associated with your account and what the account represents.
You can add picture to your profile to distinguish and identify you on the log in screen from other accounts. You can change the picture to any already included in Ubuntu or add a unique picture of you from your camera or phone.
When setting up account image, you can take and use picture that you snap from your laptop camera or download and import pictures from anywhere. Once you add a picture, you should see the new image on the login screen to identify your account.
By default, if you don’t add image to your account profile, a black image space will be added and left blank. All users will have the same image, except unique account names.
How to add account picture in Ubuntu Linux
As described above, users can add and remove account picture in Ubuntu Linux.
Below is how to add, change or remove account picture in Ubuntu Linux.
Ubuntu Linux has a centralized location for majority of its settings. From system configurations to creating new users and updating, all can be done from the System Settings panel.
Alternatively, click on the System menu at the top-right corner of the top bar on your desktop.
On the System menu, select Settings as highlighted below.

In the Settings app, click on Users tile to open the panel.

In the System Settings -> Users settings panel, select the user account that you want to change its profile picture.
Next, click the image space next to the account name to choose other pictures available to you.

Once you click on the image space, it will list available images you can choose from or select other files from your computer or camera.

That should do it! You can now close the Settings app.
Conclusion:
This post showed you how to change your account picture in Ubuntu Linux. If you find any error above or have something to add, please use the comment form below.