Generations from original, uploaded illustrations


I am new to AI generated imagery. I am a visual artist and animator. I have uploaded a number of my originals illustrations and Dall-E has generated variations.

This may be a stupid question but since Dall-E accesses billions of images already existing for these variations, how sure can I be that the generations from my original drawings won’t be literal copies of a few existing images or are these actually an assimilation of an, almost, infinite amount of images?

I am attaching examples. First one will be my original and the remainder will be the generated works.

Thanks so very much!
PS: Actually as a new user I can only attach one image comparison.