The best way to make a slide with a smartphone screenshot:
- Get a stock image of a smartphone without the device maker brand (using Google Image search might get you into copy right issues)
- Take the actual screenshot on your smartphone, in my case I use my iPhone browser to go to the web page and press the home and on/off button at the same time. Email yourself the image
- And here comes the trick: apply a subtle inner shadow to the image. You see the difference in the image below, the left side one looks a little bit bland, the right side looks much more natural
