Chatter feed posts and comments are not counted against your data storage limits.

File storage includes files in attachments, Files home, Salesforce CRM Content, Chatter files (including user photos), the Documents tab, the custom File field on Knowledge articles, and Site.com assets.

Reference Link

https://help.salesforce.com/articleView?id=overview_storage.htm&type=5

To get the photo storage,

1. Go to Storage Usage.

2. Check Current File Storage Usage.