Note that you see 2 Next buttons below....the one on the left advances the entire pages in this album...the Next button on the right advances each individual picture.

You can move any of the small pictures at left over to the right by simply clicking on them.

Once a picture is moved to the right..place your pointer on that picture and a transparent window will open, from that window you will see additional size options to increase the size of that picture...simply choose the size option and Click on it...