Is there a way I can delete all my Google+ pictures?
You cannot delete all your photos in one action. You have to delete them album by album.
Sign in to your Google account
Go to Picasa Web Albums
You may have to click through if you see "Click here to go back to Picasa Web Albums." appear
Click and open an album
Select Actions → Delete album
Do this for each album you want to delete.
This will also remove those from your linked Android phone.
The only way to delete all your photos in one go is to delete both Picasa and Google+ accounts.
There is an easy way to delete each individual photo.
- Open up your Google+ Profile.
- Click on your profile photo to open the photo slider.
- Move your mouse around.
- Click the trash can that appears in the slider's upper right hand corner.
This method deletes the little photo icon options in your Gmail as well.