If you would like to pick a few pictures to download, here's how:

1. Go to the gallery you would like to download pictures from.
2. Make sure you are on the front page of the gallery, with thumbnail images.
3. Look near the upper right corner of the page and click on "Select Photos".
4. You should now be able to click in the lower left corner of each thumbnail to select it.  You can also select all or none in the bar just above the top row of photos.
5. Once you have your images selected, click on "Download" - it's near where the Select Photos button was.