You should a button to each feature with a left and right half to split them up, eg splitting wing colors to have one white wing and one black wing, left antler and right ram's horn, etc. And for the features that don't have a clear left and right half, eg the tail, add the option to split them and choose from different gradient options for colors (fade, splotched, clean line, rough line, etc.) Also a button to remerge the features.