HD Wallpaper: Portrait Collage
The image is made by Michael Drummond and from his courtesy can be downloaded free under CC0 license and use in non-commercial (desktop backgrounds, homescreen phones) and commercial (blogs, apps, templates...) projects.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
Samsung Galaxy Tab & iPad: 2048x1536 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)