To view larger pictures, just click on a picture, and a new window will open with the picture in it.
To copy these small pictures to your local PC, put your cursor onto the picture, click with the RIGHT mouse button, and select "Save Image As ...". You can then leave the filename the same, or change it to something different.
For the full size picture, click with the LEFT mouse button. This will open the larger picture in a new window, then RIGHT click for the option to save the image.