Professional App Store Thumbnails

I need a skilled graphic designer to create a full set of thumbnail images for several Android and iOS applications. These graphics will appear on both Google Play and Apple’s App Store, so each file has to meet the current sizing and format guidelines for the two platforms. My brand voice is professional and formal, and the thumbnails must reflect that—clean layout, balanced typography, and a polished colour palette that looks credible at first glance.

You will work from my existing app icons, screenshots, and brief copy, adapting them into eye-catching yet understated compositions that entice users to tap while still feeling trustworthy. Please optimise every asset for Retina and high-DPI displays, keep file sizes store-ready, and save final exports in PNG as well as layered source files (PSD or AI).

Deliverables
• Separate thumbnail sets for Google Play and the App Store, sized to each platform’s exact requirements
• Layered source files for future edits
• Ready-to-upload PNGs, named and ordered per store guideline

Acceptance criteria
• All images display crisply at full and reduced resolutions with no clipping or artefacts
• Consistent professional-formal style across every variant
• Files pass Google Play and Apple App Store submission checks without modification

Let me know your timeline, the number of revision rounds you include, and links to any previous store graphics you have produced.