From your google+ stream, click on the photo you want to download. While you are in Google+ photos (larger view of the picture), click on the Actions drop down button on the bottom of the photo. Choose the Download photo option. Full photo will be downloaded.How do I find my photos on Google +?
To check the number of photos you have stored on Google Photos, the only place is Google Dashboard: Go to the Google dashboard on your computer and log in. Scroll down until you see Google Photos. You should see an Album count and a Photos count. This is how many photos you have in Google Photos.