I just uploaded another game to Google Play, but THIS time I had the sense to copy all the images sizes that Play requires when you upload a game.
Image Sizes
App icon *
Your app icon must be a transparent PNG or JPEG, up to 1 MB, 512 px by 512 px, and meet our design specifications and metadata policy
Feature graphic *
Drop a PNG or JPEG file here to upload
Your feature graphic must be a PNG or JPEG, up to 1MB, and 1,024 px by 500 px
Phone screenshots *
Upload 2-8 phone screenshots. Screenshots must be PNG or JPEG, up to 8 MB each, 16:9 or 9:16 aspect ratio, with each side between 320 px and 3,840 px
Added information below Phone Screenshots
To be eligible for promotion, include at least 4 screenshots, with at least 3 in 16:9 or 9:16 and at least 1080 px.
Tablet
7-inch tablet screenshots *
Upload up to eight 7-inch tablet screenshots. Screenshots must be PNG or JPEG, up to 8 MB each, 16:9 or 9:16 aspect ratio, with each side between 320 px and 3,840 px
(I use the same as above)
10-inch tablet screenshots *
Upload up to eight 10-inch tablet screenshots. Screenshots must be PNG or JPEG, up to 8 MB each, 16:9 or 9:16 aspect ratio, with each side between 320 px and 3,840 px
(I use the same as above)