The sources for your images are not valid. You can't just get images off pinterest which is basically the same as using google or source images from other blogs which have sourced their images from elsewhere.
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You have to click on them and they will show the source. Even once in the blogs it is hard to determine where they came from (like you mentioned). Where do you suggest to get images from that can be properly sourced? It seems like a tedious task for 2 pennies lol
http://carrington.edu/blog/student-tips/careers/resume-strategies-for-success/
http://malini-math.blogspot.com/2010/08/maths-and-nature.html
Having to go down the rabbit hole of sources to get to the original source is not something that should have to happen.
Also do you know the copyright of the butterfly image? Do you have rights to distribute that image and host it on your article? Do you even know the original photographer? It's highly likely that the blog is plagiarising that image itself. Or they were responsible blog authors and purchased the rights to use the image.
But just because the blog is using it, that does not mean you can use it.
I suggest in the future you source your images that are free of copyrights under Creative Commons CC0. There are websited that catalogue these, however I have found copyrighted images on these "royalty free" websites.
I've just done a search on Flickr.com for images that are allowed to be modified and commercial use. You however must attribute the original author.
https://www.flickr.com/search/?text=butterfly&media=photos&license=4%2C5%2C9%2C10
https://creativecommons.org/licenses/by/2.0/