4K HD Wallpaper: Blade 180 QX Drone
If you look for a free CC0 image with a drone check this one. Florin Pircher shared under CC0 license and here's optimized for use in desktop backgrounds, homescreen phones, web design projects, blog articles...
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)