Google Drive and Google Photos should be considered separate services. As @beacon5 said, there is an integration that Google has with Google Drive and Google Photos that allows you to view your Google Photos from a folder within Google Drive. Google Photos doesn't have a specific integration available that allows 3rd party linking, so we are not able to link to it directly.
Important Note: Unfortunately, any photos/videos you upload to the Google Photos folder via Google Drive (if the above integration is enabled) will still count against your quota, no matter what the size or the settings in Google Photos.
This means it is fine to sync Google Photos down to your system from within Google Drive, but you should be aware of the implication of uploading new files to that folder.