Cropping and ordering photos.
You can now modify the framing of each of the photos by clicking on the "Crop" tool (3rd icon). In addition, you can change the order of pictures. Simply click on the 4 arrows icon, and drag the photo to the desired location.
When these steps are complete, click "Save". You can move and resize your block like any other block. Do not forget to save your page by clicking on "Send" at the bottom of the page.