maybe a few copyright issues

so the theme of the competition is 8-bit, I want to make some pixel art, I searched google for some inspiration, I found many good examples, the problem is that I copied or rather I based in these example to create my own sprites, perhaps i think that I can have some issues with copyright. but these examples are usually only a single image and I had to create the rest to make animations. an example of what I say:

the original:

my based sprite:

hopefully this is not a big deal