For everything on the steam store we need a couple of image assets. These are especially important for our Krita 3.1 App, but should also be provided for our Series and the individual episodes:
Header capsule image* 460 x 215
Design: This image should focus on the branding of your product. For best results, please use the same artwork that you use for any retail box or marketing and make sure the logo is clearly legible.
Usage: It will appear at the top of your page in the store, in the 'recommended for you' section, in 'grid view' in customers libraries in the Steam client, in browse views on Big Picture mode, and for daily deals if applicable.
Sizes: Please provide '460px x 215px' . A '292px x 136px' image will be automatically generated from this.
Small capsule image* 231 x 87
Design: These are small, so for best results focus on making the logo clearly legible.
Usage: These are used for all the lists throughout Steam. Search results, top-sellers, new releases, etc.
Sizes: Please provide '231px x 87px' image. From that, two smaller sizes (120x45 and 184x69) capsules are automatically generated.
Large capsule image* 467 x 181
Design: These should be designed to market the product. For best results, please use the key art and logo that is being used for any retail boxes or marketing. Avoid using quotes or other strings of text beyond the title of your game
Usage: These appear at the top of genre and publisher pages and ocassionally on special promotional pages.
Sizes: Please provide '467px x 181px'.
Main capsule image* 616 x 353
Design: These should be designed to market the product. For best results, please use the key art and logo that is being used for any retail boxes or marketing. Avoid using quotes or other strings of text beyond the title of your game
Usage: These appear at the top of the front page.
Sizes: Please provide '616px x 353px'.
Five Screenshots, ideally 1280 x 720 or 1920 x 1080
Here's the crappy capsule images i made for each episode of Secrets of Krita (since they all get an individual store page, too, it seems): https://imgur.com/a/KmuHu