I can barely imagine that. If an image is longer, it always automatically will become shorter. You can see it on my page as well. Those are full sized images, but they automatically adjust to the box size.
you cant repeat an image. I advice you to remove the right panel, and make a seperate intoduction panel like mine. There also seems to be something wrong with the coding since (atleast on my laptop) the left half of your text box is completely gone.
first thing: right click on the image you want to use and select "show source" (or whatever it's called). now, you may see ALOT of confusing stuff. All you need to do is look for a link with the name of the deviatation. BUT there is one thing. The link must contain .jpg at the end of it. (ofcourse this depends on the file). Copy this.
Now, you need to go here: [link] Then input the code and click "get code". Copy this code.
Make a custom box on your page and input this code using "edit". then input other codes and/or your text in the "content here" thingy (i dont know what its called, otherwise it must be "text here" or something) and you're ready to go!
Hope this was usefull ^^
If you'd like I will upload some screenshots of my custom box codes and give you some more usefull codes to customize your boxes!