Personally I suggest that you identify the parts of the draws you like to be more specifically the eyes of this page, the body shape of that one you know instead of trying to draw like him or her just how he draws those parts and practice to draw it like that. That way you can create your own style by drawing the things you aspiring to. I say this because a friend of mine is easy to him drawing manga but when he tries to draw something more western it always can't get out of manga style so he had to pay atention to how the hair was made(you know how manga character it doesn't matter if the hair is up or down it always end up in a kind of spike) , then the eyes, then the hands you know not just watching but really paying attention to the constitution of lines of the draw so he can integrate that to his art.