Hi Vibhu,
Thank you for posting in Microsoft community. I understand that you want to remove your profile picture from Teams. Please follow these steps.
Step 1: Open the Microsoft Teams app on your computer or the Teams web app from any browser. Login to your account.
Step 2: Click on the profile picture icon at the top. A menu will open. Click on Edit profile.
Step 3: You will see the Remove picture option. Click on it and hit the Save button.
If this method does not remove your picture, you may remove it from your Microsoft account. However, that will remove the photo for all the Microsoft products.
Here are the steps:
Step 1: Open account.microsoft.com on your computer and log in with your account credentials.
Tip: You can open the webpage from a mobile browser as well. Request the desktop site if the mobile site doesn’t work properly.
Step 2: Click on your name at the top or hit the Your Info option
Step 3: You will reach the profile screen. Click on Change picture.
Step 4: On the next screen, click on the Remove button.