I'm not a professional artist and this is absolute barebones information, but sometimes simplicity makes it seem less like a daunting task!
I have not drawn Blue (yet.) nor am I black, but it's not that hard to understand why people are picky. Correct me if I'm wrong, but Blue is literally the first CANONICALLY confirmed black deltarune character that also happens to play a major role in the story; don't erase that!!