You have many colors that look almost identical to each other that are different.
Try going over your image with a bucket and try to change around colors, you'll see what I mean.
The area around the left of the ship is really confusing, the ring of orange it following perspective but the butt of the ship isn't...
It seems like you're throwing some white pixels in there randomly, it doesn't accomplish the effect I was trying to show you.
You should really read over that tutorial I posted and study the examples. It wont take too long.
Wherever there is an edge, or a space pointing right at your light source, there is a highlight.
I'd also recommend not working on a black background.