The cover art doesn't scale and the arrow placement/size in the header is also wrong.
This is my xml for the cover art: https://gist.github.com/hanleyhansen/23db5012b65e53f4a37a
What are some best practices to supporting different screen sizes?
Your XML says to center the image inside the view bounds. Your cover art is too low resolution to fill the space that you expect it to. You should either provide larger art for higher densities, or set the ImageView to a specific height and set the scale type to fitCenter.