By the way, I don't know why 2 of the same pixel art works about death were uploaded accidentally. Could you delete 1?

Sorry, but I do not understand which the problem is. My original pixel art is at 512x1512 pixels (the big image) then I created the preview rescaling it to 100x100 as it needed to be. This can't be done? What do you mean by re-size rendering?

Thanks in advance.