NuORDER does not crop your images.
When loading dashboard images, you select the percentage width that you would like for your images and the height is determined by the height of your image.
For example, if you load two images that are 50% width and one is 300 x 300 px and the other is 300 x 320 px, the second image will be 20 pixels taller than the first on the page.
If you are loading 1/3 and 2/3 images and want them next to each other, they should still be the same heights (but the 2/3 image can be twice as wide). For example, the 1/3 image could be 300 x 300 pixels and the 2/3 image could be 600 x 300 pixels.