4K HD Wallpaper: Equestrian Show
Lovely 4K picture made by Wendy Corniquet and available from her courtesy under CC0 license. Download if you like optimized for use in desktop backgrounds, homescreen phones, blog articles, templates, apps...
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)