Trouble finding proper credit? Reverse search it!
Also, it is important to note that finding the original artist of the artwork will often produce a better quality work to share! 😀
Image Raider: https://www.imageraider.com/
For iPhone: Bing Search and Feed https://itunes.apple.com/us/app/bing-fast-beautiful-mobile/id345323231
For Android: Google Goggles https://play.google.com/store/apps/details?id=com.google.android.apps.unveil&hl=en