I'm pretty sure that many, if all of those images are not yours and you have not provided any attribution. This is not acceptable, unless you can prove that these images were licensed as free to use.

For example, third image has been taken from this site: http://caribs.net/karibskie-ostrova-velikobritanii/ - it was apparently uploaded there on 2016yr.

I've looked for other images as well:

example 1

example 2

example 3