These cues sound really good.
I agree about Williams - he is probably the greatest since Herrmann, Goldsmith and Korngold. Also he does a full tilt symphonic development as you say within a film context to a fantastic degree. E. T. for example is like a symphony combined with a movie, and Spielberg gave Williams full reign to develop it. That's true about Williams having direct influences from many orchestral composers - something impossible to avoid in this day and age - , and some people have tried to say he was plagiaristic because of it but he is not. He is truly original with his own style and themes that are instantly recognizable.
Anyway, you don't have to worry about whether you are copying somebody if you truly love what you are doing. Your own style will come through all by itself.