Needs one or two more fin/tail structures, or something to make it look a bit sharper and more dangerous.
Here's my humble suggestions:
I'd make the wings a bit more swept.
Add a thin, roughly triangular sweep to the underside with a base from the nose to the middle of the wings, with the tip being aboout half way between the engine and the end and a little ways down.
Add another one to the top, also thin and swept back but shorter and with a smaller base to the top, about in the middle.
The end effect should look vaguely shark-like. If that's the look you're looking for, IMO all you lack is pointiness on your wings and top/bottom fins.
Looking nice, though- the underside especially looks very well done.
Just wondering- what's your face count?
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