Royalty-Free Research Photos, orientation: horizontal, dominant color: gray, sorted by aesthetic score
- 3264x2448 Public Domain
- 3424x2739 Public Domain
- 4460x2973 Public Domain
- 3000x2000 Public Domain
- 4924x4924 Public Domain
- 5025x3350 Public Domain
- 2328x1378 Public Domain
- 2274x1506 Public Domain
- 5472x3648 Public Domain
- 3000x2000 Public Domain
- 5014x3343 Public Domain
- 5184x3456 Public Domain
- 6000x4000 Public Domain
- 5472x3648 Public Domain
- 2700x2700 Public Domain
- 4460x2973 Public Domain
- 4460x2973 Public Domain
- 5472x3648 Public Domain
- 3000x2007 Public Domain
- 1920x1280 Public Domain
- 3456x2304 Public Domain
- 3000x1996 Public Domain
- 5472x3648 Public Domain
- 3000x3000 Public Domain
- 2400x1261 Public Domain
- 5267x3511 Public Domain
- 3456x2304 Public Domain
- 6016x4016 Public Domain
- 2400x2400 Public Domain
- 3888x2592 Public Domain