Start with the technical requirements
Platforms and distributors may specify dimensions, file types and restrictions on text or logos. Check the current requirements before exporting.
Work from a high-resolution square canvas and keep a separate editable source file so corrections do not require rebuilding the design.
Prioritise thumbnail readability
Artwork is often seen at a small size. A strong focal point and clear contrast usually matter more than tiny decorative details.
Preview the cover at phone-sized thumbnail dimensions and remove text that becomes unreadable.
Use assets you have permission to use
Photos, fonts, illustrations and logos can have licence conditions. Confirm that the intended commercial use is permitted.
Keep a record of asset sources and licences alongside the project files, especially when using stock or commissioned work.
Export and inspect the final file
Compression, colour changes and accidental cropping can affect the final appearance. Inspect the actual export rather than only the design canvas.
Open the exported image separately, check edges and text, and confirm the filename matches the release version.