With screenshots you are using someone else's wallpaper. Only they have the right to control its distribution. That means is you post a screenshot where the wallpaper is sufficiently unobscured that someone could extract the image and use it, then that is effectively redistributing the image without the author's consent.
The secret with screenshots is always to cover some part of the wallpaper which cannot be cloned or recreated in any way. In that way the copyright of the wallpaper author is protected
Yes. It is always best to cover part of the wallpaper which cannot then be copied.
What you see a lot of is people with a nice clean looking wallpaper, who then arrange items around the main image. Looks great, but leaves the wallpaper open to be copied...
If there is a main image, or central image, it is best to cover part of that. If it is not, the screenshot will be rejected.
Oh, yes....still....
The very real issue with wordy dissertations is the likelihood that your audience will dwindle in direct proportion to your effusive verbosity.
The longer it takes to clearly make your point the less people will remain to actually get it...
Those that DO stay the distance are often those who actually don't NEED to ....