Your colorings are poor imitations of Amaretti's work. I'm sure that Amaretti took time to pick a light source and pick which colors would go best with the scene and character. And her use of texture is simply amazing, subtle or not.
You should use Amaretti's style as some what as a stepping stone and change into something your own. For starters, I would say you should not reference any of her work. Because if you do it from memory, it will be stylized some what.