4K HD Wallpaper: Lovely Deer
Not quite sharp this photography at full size, but at HD standard or smaller it is absolutely perfect. Check it and see if you like, because can be saved under CC0 license from courtesy of Vladimir Kudinov. Here's optimized for use in web design projects, blog articles about deer, social media, desktop backgrounds, homescreen phones...
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)