Good to see your interest in keeping the edits going. However, I have noticed that you were replacing the profile images in certain characters and it has become a cause of concern among the other contributors. Personally, I have no problems with the act of replacing profile images. That said, the replacement images are usually side-facing, which is not an improvement to the established profile images which are mostly front-facing. There are currently no strict policies in place regarding infobox profile images, but it has been agreed upon that some pointers are considered when proposing a replacement image.
If unsure whether the current profile image deserves to be replaced, you may ask for it pending approval instead of changing it right away.