When displayed as an avitar, the image is sized to 100 x 100 pixels. The problem isn't the size of your image, which is 200 x 190, but with the dimensions - it's wider than it is high. When the image is cropped for an avatar display, there is more room for height than for width. So, a picture that is taller than it is wide will appear "normal" when displayed as an avatar. You could adjust the image and put it on a black background so that the dimensions are reversed, then upload it, and it should be fine.