Featured Graphic is an 1024px x 500px image that Google Play editorial team uses if an app is selected as Editorial Choice. Creating a Featured Graphic that will do a great job of highlighting your app requires special design consideration.
Do's & Dont's
Your graphic is not an ad, it’s a teaser. It’s a place for bold, creative promotional images. Vivid background colors work best. Black and white are problems because those are the backgrounds used by the mobile-device and Web versions of Google Play. Limit Text to your app name and maybe a few additional descriptive words. Anything else will be unreadable on phones, anyhow.
Make the graphic fun and enticing.
Use colors that stand out on black or white backgrounds.
Promote your brand prominently.
Create a text-heavy advertising-style graphic.
Let the graphic fade into the background.
Overload the graphic with details.
Device imagery is tempting, but becomes dated fast, and may be inappropriate if your user’s device looks entirely different.
In-app screenshots are inappropriate because your product page already includes a place for these.
Just using your app icon is a failure of imagination. You have more room; put it to good use!
Your image has to be designed to scale; it will need to look good both in a full-size Web browser and on a little handset. You can rely on the aspect ratio being constant, but not the size. Here’s a tip: Try resizing your image down to 1 inch in width. If it still looks good and conveys your brand message, you have a winner.