1. All I suggest is to use "DirectLink" from sharing options.
2. Use "Image" button in Your new post and insert link there.
3. Use "Preview" before "Reply to the post".

About Your's lights:
I'am not passion for lights but is there because You use'it.
I've see at least two lamps on floor which are reflected on the picture or mirror on the wall;
Adjust their light or turn it off or mark as invisible and see what happen.

PS. I'am not aware about security or viruses (I'am under linux) but I have to make clean on files after see it.