title: Which screen sizes consider when designing for Windows Phone 8.1?
body: <p>I'm writing Windows Phone 8.1 application (I don't care about tablets and desktops in this case) and I'm not sure which screen size psds should I ask from a graphic designer?</p>
  
  <p>I have read design guidlines for Windows Phone 8.1, I get the system of scaling images and their name convention, but I haven't found the advice which screen sizes should I consider in real?<br>
  I got a psd from graphic designer in size 720x1280 and there is a background image. Is it enough?  </p>
  
  <p>If I get it right, Nokia Lumia 1520 has a screen resolution 1920 x 1080 so I need also that size, right?</p>
  
  <p>How scaled psds do you usually get from a graphic designer for Windows Phone?</p>
  
  <p>Thank you</p>