I'm not very familiar with the style, but the shading looks okay for the most part. Why do the short haired twin's pants get darker closer to the inside when the other two aren't like that, though? That's the only thing I can spot right now that looks odd in any way.
I didn't really want to make it all white, so I inverted the colours.
I think you overshadowed them. Notice how the original sprites are almost flat. The twins' faces also don't look good because of that: there's so much shading on it that makes it kinda creepy.
I wanted make the twins creepy.
And also it's not exactly supposed to be like the other Mother styles.
I posted
it looks cool the robot looks weird because I hate you