Please follow the below steps to add a profile picture, which will show in the team status and ticket reply's in your CE:
1- Go to http://en.gravatar.com/site/signup/
2- Enter your e-mail address (valid e-mail address used in CE staff profile) and click on the 'Signup' button.
3- Go to your e-mail and activate the gravatar account using the link provided in the account activation mail which will be sent to you.
4- After completing the activation process, add your image from PC / internet
5- Accept the image as your gravatar profile image for that e-mail address.