As it turned out, Elena had actually directly copied the pixel art from various sources. When accused of copying it, she published a screen capture video claiming to show that she had created the artwork "pixel by pixel", but people were quickly able to find the true sources of the artwork.
Eventually, she came as close to an admission as she is apparently going to get in an announcement that she would be pausing the sale: "I have heard your concerns about the art and I will be working to fix the file quality and any images that might be seen as 'copied' as they were only retraces and I never had any ill intent whatsoever."