K-ON! characters in a four-panel art style HD Wallpaper

The image is divided into four panels, each featuring a profile view of an anime character. The top left panel shows a girl with short brown hair. The top right panel shows a girl with brown hair wearing a checkered cap. The bottom left panel shows a girl with light green hair wearing a green cap. The bottom right panel shows a girl with black hair wearing a purple cap and goggles.