Yes, the streaks are a bit too wide, though its rare to see them done to proper scale. In anything smaller than 1/16th they probably shouldn't be shown at all, but you frequently see them looking about the size of yours on much smaller figures. For me, the best way to do them in scale is a fine, long bristled brush and thing paint. I used a quick flicking motion to get a thin streak. Its takes a little practice to get the feel of it, but you can get some very fine streaks doing it that way. Its also useful to note how on the real thing the streaks aren't everywhere in a random pattern, but are sort of in diagonal rows, with blank areas that have no streaking.I see on yours you did leave those open areas without streaks. Overall, I think you did a pretty nice job, the streaks don't detract much at all.
Cheers
Jason