google mapsphoto-sharingphotos
Is there any way to update my own photo on Google Maps without deleting it and uploading again?
For instance, I have some poorly merged panorama uploaded, which has already some views:
And I want to do some very simple fix like below along with keeping those views saved.
Of course, Google's policy might not allow changing the content of the photo, but I think such changes can be considered as enhancements (as well as small color correction, horizon fixing, lens distortions, etc.)
In the bottom right corner of the map, you'll see a tiny link: 
. This will bring up the Report A Problem dialog.
More information can be found here (it's the Learn More link in the dialog).
EDIT: Here is a page with a bit more information with other links and ways to edit information: Google Maps: Fix a problem
If this still doesn't work, the map provider is always listed at the bottom of the map. Chances are good that they will have their own way for submitting corrections. You'd need to identify the provider and then do a search.
Best Answer
You just can't. There is no such feature on Google Maps which would allow you to do so. Your only option is to send feedback and requesting such functionality or try to solve it with Google via their feedback system: