Create the image file in PNG Format having the  name screenshot.png and save it in themes root folder.
The recommended image size is 880×660 though it will only be shown as 387×290 but the double-sized image allows for high-resolution viewing on HiDPI displays.
If you don’t already have a screenshot of your theme, You can create one easily by following below steps:

  1. Point your browser to the blog currently using the theme.
  2. Press the Print Screen button on the keyboard.
  3. Open a new file in Photoshop.
  4. Change the size to 300 by 225 (in pixels)
  5. Press Ctrl + v or Right click > Paste.
  6. With the Move tool activated, resize the screenshot to in the 600 x 450 space.
  7. Go to File > Save for Web…
  8. Save it as a PNG file.
  9. Name it screenshot.
  10. Place your image file in the theme’s folder.
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