The pistol grip looks like it's based on an actual pistol, you can see the shape support a magazine well and everything.
A rifle-pistol grip don't look like that since it's only an economical aid where no magazine need to fit inside the hand.
The thumb hole bullpup is a staple of sci-fi design, fine, but the thumb hole looks a bit too tight, would widen it some.
The butt of the rifle looks uncomfortable to shoot. Add a slanting towards the telescopic stock to provide a safer more comfortable cheek rest.
Pic related, look at the cheek rest of this SCAR rifle for example, now Imagine if the butt of the rifle was shaped like on that gun.
The lack of a trigger guard looks real stupid and dangerous to anyone who's ever been around live firearms