Friend, you should try to make your images the most appropriate to your card view. your images are very rectangular, you need to put a more square image like the card view you generate. Do not expect kodular to expand the image as much as you want because it will not do it unless you use an extension that I have no idea what it would be. But it is not the idea because if you expand it, the one that you show in all that card view will lose a lot of shape.
Solution: change the size of the card view to a more rectangular one like your photo or use an image more in line with the size of your card view.