the outlines are done wrong as what Brad had said, should only use 2px brush and not 1px or else it'd look wrong.. I recommend checking the #art-channel in rise discord server to check the following format: including the dimensions and brush thickness
i have mentioned above that you should only use 2px thick brush for creating the sprites XD the shades on the hair as well as the outline is 1px thick only
i created one (the left side) so that you can compare how it should look like.. sorry if i didn't actually made it how you wanted lol.. basically using 2px brush, you can't really put much details on it.. i hope this helps you