There is one thing I should warn you about as I see that you are a new Steemit member.

You claim that you have purchased all the images, and I believe that is true.
You also claim that you have the right to use them (even) commercially, so let's say that this might be true either although we don't know that as you are not providing the information under which license this right has been granted to you.

The photo source that you are giving, is not the image source, in fact.
It's your referral link to getstencil.com website, and it hasn't anything to do with the photo that you used in your article(s), and that especially because you are using the same photo source link in all your posts.
Fake image/photo sources are not accepted on Steemit, and your posts might get penalized (downvoted) just because of that. Please, take care of it!

In other words, you don't credit the author of the photo, in fact, what might be one of the license conditions for commercial use (and very often it is, but we don't know that as I said before, because you don't provide the info about the license).

In this particular case (for the photo used in this article) it wouldn't be a problem as the photo is under CC0 Creative Commons license which license doesn't require attribution.

But in general and above all of that, keep in mind that GetStencil.com can't be the photo/image source as it's only a tool, (same as PhotoShop or any other free or paid image manipulation tool out there).

In other words, even if you are paying for the tool usage, it doesn't mean that all the photos that you have access to (through it) are free to use for commercial purposes.

Meaning, many images/photos might be free to use on Facebook, Twitter, Pinterest, Instagram or some other similar networks (as the users are not getting paid for posting there), while the same ones are not allowed on Steemit and other similar sites where we are paid for our content.

Therefore, it's very important to check the license for each photo/image that you use, and when and where that is needed to give the proper attribution to the author if you want to stay out of copyright trouble.