its not that its too much but i think its the wrong way of going about it. the streaks are too solid, get a large thin brush and cut it apart randomly with a pair of scissors so that its jagged. then lightly spray silver paint on the tips. on the helmet youll want to look for hard, sharp edges, where, if you were too scrap a "real" helmet against a rough surface, damage would be the most severe. lightly run the brush across the chosen edges in the same GENERAL direction in different lengths and darkness. also, taking a rotary to heavily "damaged" areas to simulate gouges really brings out the realism. adam posted a really good video showing how to do a variant of this method.
the damage you have on it right now looks kind of....... fake? just be thoughtfully random (as in not too much) with this and less solid with the silver and this is going to look amazing.
btw im digging the hellspartan meets emile look. fits the helmet really well. nice job on the sanding too, very smooth. overall excellent job