Hello @krnel : I need to point out here is that regarding the license attribution of images. Some images of your post especially the flickr one which I looked into is a CC BY 2.0 one. One of the wiki image is CC-by-4.0 one. It requires appropriate credit and attribution mentioning. Three things are always necessary:

• Link to the source image (like the flickr link / wiki link)
• Username of creator/uploader and link to their profile (if available)
• License attribution link (if CC-by-SA Ver2 please provide that link). An example below. :
  Image Source: Flickr, Uploader: ch00n, License: CC BY 2.0

This is not a criticism. I appreciate your quality content very much. I think you will take this in a good spirit. I am giving a snapshot from CC-ver-2 page here:

Let me know your opinion.

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@dexterdev