Hi jcm4hf,
I'm sorry to hear you are having this issue with your iPhone. If you continue to have issues with the camera image quality, you may find the troubleshooting steps outlined in the following article helpful:
Get help with the camera on your iPhone, iPad, or iPod touch - Apple Support
Also, given that you have an iPhone 6 Plus and are having issues with the image quality on the camera (presumably the rear camera, based on included pic), you may want to be aware of the following program:
iSight Camera Replacement Program for iPhone 6 Plus - Apple Support
Regards