The difference is that on this, the faces of Mt Rushmore, it is easy to see the squished and stretched distortion, because it is faces.
On your other wallpapers/images, I see they are done the same way either stretched or squished to fit the pixel size of the image needed. What you should be doing instead is creating or grabbing a base image and then either cropping to the pixel dimension you need (such as 320x240) as you need, rather than stretching them in your graphics program.
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