Here, I wanted to post an image in the comment. I did a trick:
- I clicked on "Ask Question" here on Meta
- Then I clicked the icon "Add image"
- I uploaded the image from my computer and copied the link http://i.stack.imgur.com/nYoPR.png
- I pasted the link to the comment
- I discarded the question.
Is this a clean and correct approach?
An example thought why this possibly wouldn't be clean: Is the image hosted permanently? There could be, in theory, some "garbage collector" that would delete all images that are not linked from within any question (well, mine is now linked from this question, though not normally - funny enough right :-)).