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Content Samurai does it's best to auto scale the sizes of images to fit, but if the image doesn't fit your template you might find some of the image has been cropped out.
To get your picture to fit nice it needs to be either one of these sizes:
Full slide images = 1280 x 720 pixels
Half slide images = 640 x 720 pixels
Full slide images = 700 x 700 pixels
Here are instructions to resize images with Paint (Windows) and Preview (Mac):
If you're using an elongated image, like a banner, you might need to paste that image onto a blank Black or White image that fits the slide resolution.
Here are a few blank images that you can paste your image/banner onto before uploading it to Content Samurai:
(right click and Save As)