It looks like the maximum width of the pictures needs to be about 410 pixels to fit the layout. Try adding width="410" to the image tags.
Or you could open the photos in an image editor to size them down, and re-upload them.
img src="http://render2.snapfish.com/render2/is=Yup6aQQ%7C%3Dup6%3DzqH%3AxxqUD7qRUrKxzX7BHpUUKxgXP0G%3F87KR6xqpxQQQJxo0nxlPnxv8uOc5xQQQ0QlaaGJQPJqpfVtB%3F*KUp7BHSHqqy7XH6gXP0G%7CRup6lQQ%7C/of=50,590,442"
How would I set it up?