If you're a team owner you can upload a picture that'll show next to its name.
To change your team image:
-
Go to the team you'd like to update the picture for.
-
Hover over the the team name to select More options 
> Manage team 
.
Note: Manage team is only available to team owners. You must be a team owner to change the team picture.
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In the Settings tab, expand Team details and select Change picture 
under the existing team picture.
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Select Upload 
to choose a new image from your files, or Remove 
to remove the chosen team picture.
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Select Save to save your new team picture.