I am no lawyer but this is my understanding.
Yes you can sell artwork created with stock media.
You can not sell stock media products created with other stock media products.
so
If you have created a finished piece of artwork that is ready to hang on a wall then you can use any stock media in its creation and sell the final artwork.
however
If the image that you have created is intended to be used as a creative element in further works then you can not sell that because it uses elements that you did not create.
Imagine if it was a font.
You could create a poster that uses the font and sell that.
But you could not alter the font in some way and sell that.