Hello Angelika, and welcome!
To post an image here as Jeff Donald requests, you reply to your own thread and use the "Image Insertion" tool in the toolbar at the bottom of the text entry box:
➡️ About image size and format: images posted here must be under 5MB in size and the format must be .jpg or .png.
Pictures taken with iPhones may deafault to Apple's "HEIC" format. You can use Preview to convert, or take a new image after you change format in:
Settings > Camera > Formats
There, select "Most Compatible":

And, because I had a similar issue with my wife's phone, I must ask: Are the lenses clean?